How to improve Netbeans performance

Question

Is there a real way to get Netbeans to load and work faster   It is too slow and gets worse when you have been coding for some time  It eats all my RAM     I am on a Windows machine  specifically Windows Server 2008 Datacenter Edition x64  4Gb of RAM  3Ghz Core 2 Duo processor  etc  I am using the x64 JDK  I use the NOD32 Antivirus since for me it is the best in machine performance   In Task Manager netbeans exe only shows no more than 20 Mb  java exe more than 600Mb   My project is a J2EE web application  more than 500 classes  only the project libraries not included  externals   And when I said slow  I mean 3  4  5 minutes or more Netbeans is frozen   Is my project just too large for Netbeans  if it has to read all files to get the state of files like error warnings  svn status and more  Can I disable all this  Is it possible to set it to scan only when I open a file   My CPU use is normally at 30 percent with all my tools opened  I mean Netbeans  MS SQL Manager  Notepad  XMLSpy  Task Manager  Delphi  VirtualBox  Netbeans eats more RAM than my virtualized systems   In Linux it is as slow as in Windows in the same machine  Ubuntu 8 04 x64    It is true that the Netbeans team improved startup speed but when it opens it begins to cache ALL    I have used some JVM parameters to set high memory usage and others   C  Program Files NetBeans Dev bin netbeans exe  -J-Xms32m -J-Xmx512m -J-Xverify none  -J-XX  CMSClassUnloadingEnabled  But it is still slow

User · Answer

For Windows - Should work for other OS as well  Netbeans is just like any other java application which requires tuning for its JVM   Please read the following link to have some benchmark results for netbeans  https   performance netbeans org reports gc   The following settings works fine in my Windows 7 PC with 4GB RAM and I5 Quad core processor    Check for the line netbeans default options in the netbeans config file inside bin folder and replace the config line as follows   netbeans default options  -XX TargetSurvivorRatio 1 -Xverify none -XX PermSize 100M -Xmx500m -Xms500m -XX UseParallelGC   netbeans default options    Small Suggestion  Garbage collection plays a vital part in JVM heap size and since I had a quad core processor  I used Parallel GC  If you have single thread processor  please use UseSerialGC  From my experience  if Xmx Xms values are same  there is no performance overhead for JVM to switch between min and max values  In my case  whenever my app size tries to exceed 500MB  the parallel GC comes in handy to cleanup unwanted garbage so my app never exceed 500MB in my PC

User · Answer

Had the same issue with Netbeans 7 3   and 7 4 Beta on Windows 7  Switching some plugins on and off  I figured out it was the svn plugin which boosted the CPU constantly to about 27   converting my laptop into a toaster  Turn it off and code happy again

User · Answer

Really useful article about reasons why your NetBeans is slow   http   wiki netbeans org FaqSlowNetBeans

User · Answer

Is it a corporate Windows machine   If so aggressive virus scanners can really slow down modern IDEs   Check your task manager for processes that are using a lot of CPU or disk reads

User · Answer

Similar to the suggestion to put everything on an SSD   I run netbeans from freeBSD   The netbeans cache files were in my home directory in  netbeans   My home directory was mounted over nfs so access was very slow   Moving  netbeans to the local machine greatly improved performance   I added a softlink from  netbeans in my home directory to the local directory   Netbeans describes how to change the usedir and cachedir here and lists this as a reason under item 4   Prior to this I could write entire sentences in comments before the gui caught up and displayed them   After text appears as I type

User · Answer

Also defragment your disk  Netbeans is very aggressive about creating caches of one form or another  Most of them get persisted to disk at some point or another which can affect startup time  Virus scanners  Symantec in particular   Desktop search engines  and any other intrusive I O product can drastically reduce performance   I have noticed that Netbeans can be tempermental at times and its performance can vary greatly between two machines with nearly identical specs  My work machine has terrible performance and is unusable at times  but it s lightning fast when I use it on my home machine  with bigger projects in many cases

User · Answer

I use Windows 7  I suggest right-clicking the NetBeans shortcut  go to Properties  and on the Shortcut tab at the Target  add -J-Xmx1024m -J-Xms256m   This sets the memory usage of the JVM  Xms is the minimal value  while Xmx is the max   This is the value of target textfield     C  Program Files NetBeans 7 1 bin netbeans exe  --jdkhome  C  Program Files Java jdk1 6 0 10  -J-Dorg netbeans modules php dbgp level 400 -J-Xmx1024m -J-Xms256m   Since I add that attribute  my NetBeans run so fast   Another way to try More Reference Here  In the etc directory under your Netbeans-Home  edit the file netbeans conf file  -Xms and -Xmx should be increased to the values that allow your program to compile   instructions in netbeans conf       Note that default -Xmx and -XX MaxPermSize are selected for you automatically    You can find these values in var log messages log file in your userdir    The automatically selected value can be overridden by specifying -J-Xmx or   -J-XX MaxPermSize  here or on the command line    Put the values in the netbeans default options string  Example     netbeans default options  -J-client -J-Xss2m -J-Xms32m -J-XX PermSize 32m -J-Dapple laf useScreenMenuBar true -J-Dapple awt graphics UseQuartz true -J-Dsun java2d noddraw true -J-Dsun java2d dpiaware true -J-Dsun zip disableMemoryMapping true  -J-Dsun awt disableMixing true -J-Dswing aatext true -J-Dawt useSystemAAFontSettings lcd --laf Nimbus    What to do to speed up   free up memory windows    Disable Windows Update     Open Task Manager  open tab Services  disable Windows Update        Hit  Ctrl     R  and type Services msc and press enter    Sort by Startup Type Select Services from 3rd party  non windows  which run Automatic  Right click  click Properties and change startup type to Manual       Sort by Status and Stop services from  3rd party  app you think unused

User · Answer

If its on a corporate machine - make sure that the caches aren t stored on the network

User · Answer

For Windows - Should work for other OS as well  Netbeans is just like any other java application which requires tuning for its JVM   Please read the following link to have some benchmark results for netbeans  https   performance netbeans org reports gc   The following settings works fine in my Windows 7 PC with 4GB RAM and I5 Quad core processor    Check for the line netbeans default options in the netbeans config file inside bin folder and replace the config line as follows   netbeans default options  -XX TargetSurvivorRatio 1 -Xverify none -XX PermSize 100M -Xmx500m -Xms500m -XX UseParallelGC   netbeans default options    Small Suggestion  Garbage collection plays a vital part in JVM heap size and since I had a quad core processor  I used Parallel GC  If you have single thread processor  please use UseSerialGC  From my experience  if Xmx Xms values are same  there is no performance overhead for JVM to switch between min and max values  In my case  whenever my app size tries to exceed 500MB  the parallel GC comes in handy to cleanup unwanted garbage so my app never exceed 500MB in my PC

User · Answer

Everyone should note that Sun s Java Virtual Machine for Windows does not use shared memory  This means that the more heap you give to your VM  the more memory it keeps to itself  The advantage of more heap is less garbage-collection  and perhaps faster performance of the Java application you re running  but the downside is that your other applications may have less memory to work with  and your system may feel slower due to this

User · Answer

Close all the instences you have running  You might not have closed any of them in a while causing them to stack up and run in the background  Therefore causing lag making the program work slower

User · Answer

Verify if your project folder has a folder that contains files of your framework  or libraries  Ex   The Laravel has a folder vendor  - files that you not use directly  Click on your  project    properties  In left side  select  ignore folders   I don t no how is in english  but is before  Frameworks    In right side  click on  add folder   chose de folders - this will make your Netbeans 8 faster  It works for me

User · Answer

Is it a corporate Windows machine   If so aggressive virus scanners can really slow down modern IDEs   Check your task manager for processes that are using a lot of CPU or disk reads

User · Answer

Simplest solution   Go to Preferences- Editor and Disable  Auto Popup Completion Window  Use  Meta key     instead when you need code completion   The biggest problem I found was the auto code completion feature  As I typed  it kept on trying to run code completion the whole time  This was causing really slow performance since my project has a lot of libraries that it depends upon   The best thing of all is you can stop fighting the editor as it keeps picking up false positives in the completion popup   Have not looked back since I switched this off

User · Answer

Download the latest Netbeans Remove all the plugins you don t need  Use the latest version of Java

User · Answer

Everyone should note that Sun s Java Virtual Machine for Windows does not use shared memory  This means that the more heap you give to your VM  the more memory it keeps to itself  The advantage of more heap is less garbage-collection  and perhaps faster performance of the Java application you re running  but the downside is that your other applications may have less memory to work with  and your system may feel slower due to this

User · Answer

Had the same issue with Netbeans 7 3   and 7 4 Beta on Windows 7  Switching some plugins on and off  I figured out it was the svn plugin which boosted the CPU constantly to about 27   converting my laptop into a toaster  Turn it off and code happy again

User · Answer

I use Windows 7  I suggest right-clicking the NetBeans shortcut  go to Properties  and on the Shortcut tab at the Target  add -J-Xmx1024m -J-Xms256m   This sets the memory usage of the JVM  Xms is the minimal value  while Xmx is the max   This is the value of target textfield     C  Program Files NetBeans 7 1 bin netbeans exe  --jdkhome  C  Program Files Java jdk1 6 0 10  -J-Dorg netbeans modules php dbgp level 400 -J-Xmx1024m -J-Xms256m   Since I add that attribute  my NetBeans run so fast   Another way to try More Reference Here  In the etc directory under your Netbeans-Home  edit the file netbeans conf file  -Xms and -Xmx should be increased to the values that allow your program to compile   instructions in netbeans conf       Note that default -Xmx and -XX MaxPermSize are selected for you automatically    You can find these values in var log messages log file in your userdir    The automatically selected value can be overridden by specifying -J-Xmx or   -J-XX MaxPermSize  here or on the command line    Put the values in the netbeans default options string  Example     netbeans default options  -J-client -J-Xss2m -J-Xms32m -J-XX PermSize 32m -J-Dapple laf useScreenMenuBar true -J-Dapple awt graphics UseQuartz true -J-Dsun java2d noddraw true -J-Dsun java2d dpiaware true -J-Dsun zip disableMemoryMapping true  -J-Dsun awt disableMixing true -J-Dswing aatext true -J-Dawt useSystemAAFontSettings lcd --laf Nimbus    What to do to speed up   free up memory windows    Disable Windows Update     Open Task Manager  open tab Services  disable Windows Update        Hit  Ctrl     R  and type Services msc and press enter    Sort by Startup Type Select Services from 3rd party  non windows  which run Automatic  Right click  click Properties and change startup type to Manual       Sort by Status and Stop services from  3rd party  app you think unused

User · Answer

A more or less detailed description  why NetBeans if slow so often can be found in the article   Boost your NetBeans performance First  check what NetBeans is actually doing on your disk  On a Mac you can issue this command    sudo fs usage   grep  path to workspace  In my special case I got a directory which didn t exist any longer  but NetBeans tries to access the folder all the time    14 08 05 getattrlist  path to workspaces pii 0 000011 java  Repeated many  many  many times  If you have a similar problem  fix it by deleting your NetBeans cache folder here        netbeans 6 8 var cache  If your NetBeans app is still making a lot of disk I O  Check if it s accessing the subverison folders and svncache  I had to disable the subversion features with config file       netbeans VERSION config Preferences org netbeans modules versioning properties   add a line    unversionedFolders FULL PATH TO PROJECT FOLDER    SOURCE  Netbeans forums  IMHO it s mainly related to a lot of disk I O caused by missing files or folders and svncache

User · Answer

deactivate Git  Subversion  Local History  Spell checker and other unused plugins

User · Answer

Very simple solution to the problem when your NetBeans or Eclipse IDE seems to be using too much memory    Disable the plugins you are not using  close the projects you are not working on    I was facing similar problem with Netbeans 7 0 on my Linux Mint as well Ubuntu box   Netbeans was using   700 MiB space and 50-80  CPU  Then I decided do some clean up  I had 30 plugins installed  and I was not using most of them   So   I disabled the plugins I was not using  a whopping 19 plug ins I disabled  now memory uses down to 400  MiB and CPU uses down to 10 and at max to 50    Now my life is much easier

User · Answer

Download the latest Netbeans Remove all the plugins you don t need  Use the latest version of Java

User · Answer

I ve decided to research for last time why my NetBeans was running slow   I am running PC with 16GB ram and 3 5GHz 8 Core Processor  My CPU usage is around 5-20   memory is below 40  yet NetBeans is slower than my 15-year-old PC that I have stashed in the garage   After finding this topic and going through http   wiki netbeans org FaqSlowNetBeans I have realised that in the bottom right corner of the NetBeans I keep seeing a bar that states  Scanning      after trying to stop it and nothing happening I have looked further at what  Scanning     was doing and I have realised   Each time I start the NetBeans  the NetBeans will automatically scan any open projects   And here it is  I ve closed 20 opened projects and NetBeans runs as fast as Notepad

User · Answer

In order to improve Netbeans startup and build times one should  in this order     Make sure that one has enough free RAM memory  4GB Windows is enough on my 64-bit system  Buy an SSD  it makes all the difference in startup time and build time  my project build time wend from 60 seconds to 6 seconds   Watch out for the virus scanner  they can slow down random file access considerably  make sure they don   t scan your  java and  class files   Buy the fastest processor you can get your hands on

User · Answer

Try to profile Netbeans using VisualVM  If the  hot spot  is org gnome accessibility atkwrapper emitsignal    try to run Netbeans with   -J-Djavax accessibility assistive technologies      It helped a lot in my case   I don t really know why exactly this toolkit used  but looks like it s generally safe to disable it

User · Answer

Really useful article about reasons why your NetBeans is slow   http   wiki netbeans org FaqSlowNetBeans

User · Answer

This works for me      netbeans default options  -J-client -J-Xverify none -J-Xmx1024m -J-Xss2m -J-Xms256m -J-XX PermSize 32m -J-Dnetbeans logger console true -J-ea -J-Dapple laf useScreenMenuBar true -J-Dapple awt graphics UseQuartz true -J-Dsun java2d noddraw true -J-Dsun java2d dpiaware true -J-Dsun zip disableMemoryMapping true -J-Dplugin manager check updates false -J-Dnetbeans extbrowser manual chrome plugin install yes    Settings in the etc netbeans conf

User · Answer

I had the same problem with Netbeans being so slow  but it is now much better after deactivating the SVN plug-in  I think that may help    Good luck

User · Answer

Very simple solution to the problem when your NetBeans or Eclipse IDE seems to be using too much memory    Disable the plugins you are not using  close the projects you are not working on    I was facing similar problem with Netbeans 7 0 on my Linux Mint as well Ubuntu box   Netbeans was using   700 MiB space and 50-80  CPU  Then I decided do some clean up  I had 30 plugins installed  and I was not using most of them   So   I disabled the plugins I was not using  a whopping 19 plug ins I disabled  now memory uses down to 400  MiB and CPU uses down to 10 and at max to 50    Now my life is much easier

User · Answer

Download the latest Netbeans Remove all the plugins you don t need  Use the latest version of Java

User · Answer

Don t invest time in optimizing your NB installation as long as you can scale vertically  get a SSD  and faster hardware in general    Also    Add an exception for all relevant folders  e g  project dir  temp dir  to your anti virus software  or better  get rid of it    Don t use network drives for your projects   check if your home drive is local check if your IDE uses non-local folders  e g   AppData

User · Answer

In my case  I got a huge performance advantage by disabling Rainbow  it s a plugin that is used to color brackets in the code   Tools - gt  Options - gt  Miscellaneous - gt  Rainbow  uncheck enabled  Tested on Netbeans 10 with Java 8  The problem of serious slowdowns occurred exclusively with particularly large Java files  more than 5000 lines of code   while there was no problem with smaller files  within 1000 or 2000 lines of code   I made other optimizations  but this one was the most relevant  because it drastically reduced the amount of CPU used

User · Answer

If its on a corporate machine - make sure that the caches aren t stored on the network

User · Answer

In order to improve Netbeans startup and build times one should  in this order     Make sure that one has enough free RAM memory  4GB Windows is enough on my 64-bit system  Buy an SSD  it makes all the difference in startup time and build time  my project build time wend from 60 seconds to 6 seconds   Watch out for the virus scanner  they can slow down random file access considerably  make sure they don   t scan your  java and  class files   Buy the fastest processor you can get your hands on

User · Answer

Is it a corporate Windows machine   If so aggressive virus scanners can really slow down modern IDEs   Check your task manager for processes that are using a lot of CPU or disk reads

User · Answer

Verify if your project folder has a folder that contains files of your framework  or libraries  Ex   The Laravel has a folder vendor  - files that you not use directly  Click on your  project    properties  In left side  select  ignore folders   I don t no how is in english  but is before  Frameworks    In right side  click on  add folder   chose de folders - this will make your Netbeans 8 faster  It works for me

User · Answer

Close all the instences you have running  You might not have closed any of them in a while causing them to stack up and run in the background  Therefore causing lag making the program work slower

User · Answer

I had big problems with NetBeans 8 0 2  It s an old question but perhaps somebody else will end up here like me with the same problem  and I found no answer that helped me anywhere     I have NetBeans 8 0 2 with Ruby on Rails plugin  on Windows 7  The IDE was hanging up to 10 seconds on almost every change I did in some files  It was problem only with big files  but it must depend on more than that  there were other big files without the problem     The problem was caused by the  hint   Rails 3 Deprecations   I turned it off and now it s very fast  I can have everything else turned on without problems  It s under Tools - gt  Options - gt  Editor - gt  Hints     There is also some suggestions in the other answers of optimizing with startup parameters  I found these links about JVM-switches that helped me when testing to optimize  but it turned out that these settings have nothing to do with my problem   they are very old but have some useful information  Explanation of JVM-switches  Some  old  recommendations

User · Answer

I ve decided to research for last time why my NetBeans was running slow   I am running PC with 16GB ram and 3 5GHz 8 Core Processor  My CPU usage is around 5-20   memory is below 40  yet NetBeans is slower than my 15-year-old PC that I have stashed in the garage   After finding this topic and going through http   wiki netbeans org FaqSlowNetBeans I have realised that in the bottom right corner of the NetBeans I keep seeing a bar that states  Scanning      after trying to stop it and nothing happening I have looked further at what  Scanning     was doing and I have realised   Each time I start the NetBeans  the NetBeans will automatically scan any open projects   And here it is  I ve closed 20 opened projects and NetBeans runs as fast as Notepad

User · Answer

Open the file     Applications NetBeans NetBeans  8 0 2 app Contents Resources NetBeans etc netbeans conf  I added some options shown below   netbeans default options  -J-Dsun java2d opengl true -J-Dsun java2d d3d false -J-Xmx2048m      Using opengl may help you  depending on your system  I am running OsX  2048m may be too much  but does not seem to hurt  -

User · Answer

Here are my netbeans options for etc netbeans conf using G1 GC and some other improvements      netbeans default options  -J-server -J-Xss4m -J-Xms256m -J-Xmx512m -J-XX PermSize 256m -J-Dapple laf useScreenMenuBar true -J-Dapple awt graphics UseQuartz true -J-Dsun java2d noddraw true -J-Dsun java2d dpiaware true -J-Dsun zip disableMemoryMapping true -J-Xverify none -J-XX  UseG1GC -J-XX  TieredCompilation -J-XX  AggressiveOpts -J-Dswing aatext true -J-Dawt useSystemAAFontSettings lcd -J-Dorg netbeans editor aa extra hints true    The font settings  swing aatex and following  are optional - set as you need or remove   Those settings are boosting my netbeans a lot

User · Answer

I had big problems with NetBeans 8 0 2  It s an old question but perhaps somebody else will end up here like me with the same problem  and I found no answer that helped me anywhere     I have NetBeans 8 0 2 with Ruby on Rails plugin  on Windows 7  The IDE was hanging up to 10 seconds on almost every change I did in some files  It was problem only with big files  but it must depend on more than that  there were other big files without the problem     The problem was caused by the  hint   Rails 3 Deprecations   I turned it off and now it s very fast  I can have everything else turned on without problems  It s under Tools - gt  Options - gt  Editor - gt  Hints     There is also some suggestions in the other answers of optimizing with startup parameters  I found these links about JVM-switches that helped me when testing to optimize  but it turned out that these settings have nothing to do with my problem   they are very old but have some useful information  Explanation of JVM-switches  Some  old  recommendations

User · Answer

Here are my netbeans options for etc netbeans conf using G1 GC and some other improvements      netbeans default options  -J-server -J-Xss4m -J-Xms256m -J-Xmx512m -J-XX PermSize 256m -J-Dapple laf useScreenMenuBar true -J-Dapple awt graphics UseQuartz true -J-Dsun java2d noddraw true -J-Dsun java2d dpiaware true -J-Dsun zip disableMemoryMapping true -J-Xverify none -J-XX  UseG1GC -J-XX  TieredCompilation -J-XX  AggressiveOpts -J-Dswing aatext true -J-Dawt useSystemAAFontSettings lcd -J-Dorg netbeans editor aa extra hints true    The font settings  swing aatex and following  are optional - set as you need or remove   Those settings are boosting my netbeans a lot

User · Answer

deactivate Git  Subversion  Local History  Spell checker and other unused plugins

User · Answer

We can use the following JVM option to make NetBeans load run bit faster   JVM Option  -J-Xverify none   this option tells JVM not to verify byte-code during class loading and avoids preloading unnecessary classes    How to set   Edit the file C  Program Files NetBeans  lt version gt  etc netbeans conf  check your NetBeans installation folder if you installed it in another location    Find the line that says   netbeans default options       Add the option -J-Xverify none to the list of options  Restart NetBeans

User · Answer

This works for me      netbeans default options  -J-client -J-Xverify none -J-Xmx1024m -J-Xss2m -J-Xms256m -J-XX PermSize 32m -J-Dnetbeans logger console true -J-ea -J-Dapple laf useScreenMenuBar true -J-Dapple awt graphics UseQuartz true -J-Dsun java2d noddraw true -J-Dsun java2d dpiaware true -J-Dsun zip disableMemoryMapping true -J-Dplugin manager check updates false -J-Dnetbeans extbrowser manual chrome plugin install yes    Settings in the etc netbeans conf

User · Answer

Put your  netbeans Homefolder into a Ramdisk and Netbeans its going to be incredible fast   I detected on my Ubuntu 16 04 that every Key-Press causes a HDD read or write action  Reason enougth for me to use a Ramdisk  As a little positive side-effect my HDD is quite now  no tickclickrrickrrrticktick any more  and has a longer live

User · Answer

Also defragment your disk  Netbeans is very aggressive about creating caches of one form or another  Most of them get persisted to disk at some point or another which can affect startup time  Virus scanners  Symantec in particular   Desktop search engines  and any other intrusive I O product can drastically reduce performance   I have noticed that Netbeans can be tempermental at times and its performance can vary greatly between two machines with nearly identical specs  My work machine has terrible performance and is unusable at times  but it s lightning fast when I use it on my home machine  with bigger projects in many cases

User · Answer

Put your  netbeans Homefolder into a Ramdisk and Netbeans its going to be incredible fast   I detected on my Ubuntu 16 04 that every Key-Press causes a HDD read or write action  Reason enougth for me to use a Ramdisk  As a little positive side-effect my HDD is quite now  no tickclickrrickrrrticktick any more  and has a longer live

User · Answer

We can use the following JVM option to make NetBeans load run bit faster   JVM Option  -J-Xverify none   this option tells JVM not to verify byte-code during class loading and avoids preloading unnecessary classes    How to set   Edit the file C  Program Files NetBeans  lt version gt  etc netbeans conf  check your NetBeans installation folder if you installed it in another location    Find the line that says   netbeans default options       Add the option -J-Xverify none to the list of options  Restart NetBeans

User · Answer

Don t invest time in optimizing your NB installation as long as you can scale vertically  get a SSD  and faster hardware in general    Also    Add an exception for all relevant folders  e g  project dir  temp dir  to your anti virus software  or better  get rid of it    Don t use network drives for your projects   check if your home drive is local check if your IDE uses non-local folders  e g   AppData

User · Answer

I had the same problem with Netbeans being so slow  but it is now much better after deactivating the SVN plug-in  I think that may help    Good luck

User · Answer

Similar to the suggestion to put everything on an SSD   I run netbeans from freeBSD   The netbeans cache files were in my home directory in  netbeans   My home directory was mounted over nfs so access was very slow   Moving  netbeans to the local machine greatly improved performance   I added a softlink from  netbeans in my home directory to the local directory   Netbeans describes how to change the usedir and cachedir here and lists this as a reason under item 4   Prior to this I could write entire sentences in comments before the gui caught up and displayed them   After text appears as I type

User · Answer

A more or less detailed description  why NetBeans if slow so often can be found in the article   Boost your NetBeans performance First  check what NetBeans is actually doing on your disk  On a Mac you can issue this command    sudo fs usage   grep  path to workspace  In my special case I got a directory which didn t exist any longer  but NetBeans tries to access the folder all the time    14 08 05 getattrlist  path to workspaces pii 0 000011 java  Repeated many  many  many times  If you have a similar problem  fix it by deleting your NetBeans cache folder here        netbeans 6 8 var cache  If your NetBeans app is still making a lot of disk I O  Check if it s accessing the subverison folders and svncache  I had to disable the subversion features with config file       netbeans VERSION config Preferences org netbeans modules versioning properties   add a line    unversionedFolders FULL PATH TO PROJECT FOLDER    SOURCE  Netbeans forums  IMHO it s mainly related to a lot of disk I O caused by missing files or folders and svncache

User · Answer

Simplest solution   Go to Preferences- Editor and Disable  Auto Popup Completion Window  Use  Meta key     instead when you need code completion   The biggest problem I found was the auto code completion feature  As I typed  it kept on trying to run code completion the whole time  This was causing really slow performance since my project has a lot of libraries that it depends upon   The best thing of all is you can stop fighting the editor as it keeps picking up false positives in the completion popup   Have not looked back since I switched this off

User · Answer

Try to profile Netbeans using VisualVM  If the  hot spot  is org gnome accessibility atkwrapper emitsignal    try to run Netbeans with   -J-Djavax accessibility assistive technologies      It helped a lot in my case   I don t really know why exactly this toolkit used  but looks like it s generally safe to disable it

User · Answer

Download the latest Netbeans Remove all the plugins you don t need  Use the latest version of Java

User · Answer

NetBeans 8 0 2  PHP  has two problems  the SubVersion client and the Twig templates  In order to drastically improve overall performance  a  disable teh  Twig Templates  plugin  this will also deactivate Symphony2  in case you may require it  and b  override the SVN client with this switch   run args extra -J-DsvnClientAdapterFactory commandline     project properties lets one define the CLI arguments individually  which may also make sense with RAM settings and other customization   guess one could re-enable Twig once that linked bug-report has been closed  re-scanning isn t really the issue  while the rescan performs as it should    in a timely manner   Just was testing some more and noticed  that on Linux it runs way smoother with the Oracle JDK than the  common  OpenJDK - have seen there is even one version of NetBeans bundled with it

User · Answer

Also defragment your disk  Netbeans is very aggressive about creating caches of one form or another  Most of them get persisted to disk at some point or another which can affect startup time  Virus scanners  Symantec in particular   Desktop search engines  and any other intrusive I O product can drastically reduce performance   I have noticed that Netbeans can be tempermental at times and its performance can vary greatly between two machines with nearly identical specs  My work machine has terrible performance and is unusable at times  but it s lightning fast when I use it on my home machine  with bigger projects in many cases

User · Answer

In my case  I got a huge performance advantage by disabling Rainbow  it s a plugin that is used to color brackets in the code   Tools - gt  Options - gt  Miscellaneous - gt  Rainbow  uncheck enabled  Tested on Netbeans 10 with Java 8  The problem of serious slowdowns occurred exclusively with particularly large Java files  more than 5000 lines of code   while there was no problem with smaller files  within 1000 or 2000 lines of code   I made other optimizations  but this one was the most relevant  because it drastically reduced the amount of CPU used

User · Answer

Also defragment your disk  Netbeans is very aggressive about creating caches of one form or another  Most of them get persisted to disk at some point or another which can affect startup time  Virus scanners  Symantec in particular   Desktop search engines  and any other intrusive I O product can drastically reduce performance   I have noticed that Netbeans can be tempermental at times and its performance can vary greatly between two machines with nearly identical specs  My work machine has terrible performance and is unusable at times  but it s lightning fast when I use it on my home machine  with bigger projects in many cases

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NetBeans 8 0 2  PHP  has two problems  the SubVersion client and the Twig templates  In order to drastically improve overall performance  a  disable teh  Twig Templates  plugin  this will also deactivate Symphony2  in case you may require it  and b  override the SVN client with this switch   run args extra -J-DsvnClientAdapterFactory commandline     project properties lets one define the CLI arguments individually  which may also make sense with RAM settings and other customization   guess one could re-enable Twig once that linked bug-report has been closed  re-scanning isn t really the issue  while the rescan performs as it should    in a timely manner   Just was testing some more and noticed  that on Linux it runs way smoother with the Oracle JDK than the  common  OpenJDK - have seen there is even one version of NetBeans bundled with it

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Is it a corporate Windows machine   If so aggressive virus scanners can really slow down modern IDEs   Check your task manager for processes that are using a lot of CPU or disk reads

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For me worked out to enable auto-scanning of sources

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Open the file     Applications NetBeans NetBeans  8 0 2 app Contents Resources NetBeans etc netbeans conf  I added some options shown below   netbeans default options  -J-Dsun java2d opengl true -J-Dsun java2d d3d false -J-Xmx2048m      Using opengl may help you  depending on your system  I am running OsX  2048m may be too much  but does not seem to hurt  -

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For me worked out to enable auto-scanning of sources

[java] How to improve Netbeans performance?

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