pycharm running way slow

Question

I m a big fan of PyCharm by JetBrains but I do run into some issues that I thought maybe I ll ask here about    It hangs unexpectedly and this happens often  Overall  its a little bit slow for my taste and I would love some tips on how to increase the performance of the IDE Often when I open a project PyCharm seems to flag all the built-ins as Unresolved Reference warnings  things like open    str    etc  as well as some of the modules I import such as sys  these are the most common offenders         The only way I am able to fix  2  is by going to PyCharm -  Preferences -  Python Interpreters -  Paths -  Reload List of Paths but I have to do this often enough to warrant asking about a more permanent fix   My configuration  Mac OSX Lion running on MacBook Pro  mid 2010  with 8GB RAM  Now look  I understand that diagnosing things like these is difficult without any sort of snapshot or more information about what is going on  but I am simply asking if anyone has ran into these issues before and if so  how did these get resolved   Thanks   P S  I have also contacted JetBrains regarding these issues  but honestly I tend to find nice solutions to common problems here and I thought I might as well ask

User · Accepted Answer

Every performance problem with PyCharm is unique, a solution that helps to one person will not work for another. The only proper way to fix your specific performance problem is by capturing the CPU profiler snapshot as described in this document and sending it to PyCharm support team, either by submitting a ticket or directly into the issue tracker.

After the CPU snapshot is analyzed, PyCharm team will work on a fix and release a new version which will (hopefully) not be affected by this specific performance problem. The team may also suggest you some configuration change or workaround to remedy the problem based on the analysis of the provided data.

All the other "solutions" (like enabling Power Save mode and changing the highlighting level) will just hide the real problems that should be fixed.

User · Answer

I found a solution to this problem that works beautifully on Windows  and wanted to share it    Solutions that didn t work  I have 16GB of RAM and was still having horrible lag  PyCharm takes less than 1GB of RAM for me  so that wasn t the issue  Turning off inspections didn t help at all  and I didn t have any special plugins that I recall  I also tried playing around with CPU affinities for the process  which briefly worked but not really   What worked beautifully  almost perfectly    Set PyCharm s CPU priority to Above Normal Set the CPU priority for Python processes to Below Normal   You can do this manually  but I recommend using a program which will preserve the setting across restarts and for multiple instances  I used Process Hacker  Right click on the process -  Priority -  Set the priority  Then right click again -  Process -  and select  Save for pycharm64 exe  and similarly for python  Save for python exe   Finally in Process Hacker go to Options and select  Start when I log on   This will make it so that ALL Pycharm and python executables acquire these CPU priorities  even after restarting the program and or Windows  and no matter how many python instances you launch    Basically  much of the PyCharm s lag may be due to conflict with other programs  Think about it  Yes PyCharm requires a lot of CPU  but the PyCharm developers aren t stupid  They have probably at least ensured it can run without lag on an empty core  But now you open Chrome and 30 tabs  Fiddler  an FTP program  iTunes  Word  Slack  etc  and they all compete with PyCharm at the same CPU priority level  Whenever the sum of all programs   100  on a core  you see lag  Switching to Above Normal priority gives PyCharm something closer to the empty core that it was probably tested on   As for Below Normal on python exe  basically you don t want to slow your computer down with your own development  Most python programs are essentially  batch  programs  and you probably won t notice the extra time it takes to run  I don t recommend this if you are developing a graphical interactive program

User · Answer

Regarding the freezing issue  we found this occurred when processing CSV files with at least one extremely long line    To reproduce    print x  for x in    A    54790       a    1421    10      However  it appears to have been fixed in PyCharm 4 5 4  so if you experience this  try updating your PyCharm

User · Answer

Well Lorenz Lo Sauer already have a good question for this  but if you want to resolve this problem through the Pycharm Tuning  without turning off Pycharm code inspection   you can tuning the heap size as you need  since I prefer to use increasing Heap Size solution for slow running Pycharm Application   You can tune up Heap Size by editing pycharm exe vmoptions file  and pycharm64 exe vmoptions for 64bit application  and then edit -Xmx and -Xms value on it   So I allocate 2048m for xmx and xms value  which is 2GB  for my Pycharm Heap Size  Here it is My Configuration  I have 8GB memory so I had set it up with this setting   -server -Xms2048m -Xmx2048m -XX MaxPermSize 2048m -XX ReservedCodeCacheSize 2048m   save the setting  and restart IDE  And I enable  Show memory indicator  in settings- Appearance  amp  Behavior- Appearance  to see it in action      and Pycharm is quick and running fine now   Reference   https   www jetbrains com help pycharm 2017 1 tuning-pycharm html d176794e266

User · Answer

1  Change the inspection level  Current PyCharm versions allows you to change the type of static code analysis it performs  and also features a Power CPU Saving feature  Click on the icon at the bottom right  next to the lock      2  Change indexed directories Exclude directories from being indexed which are set in the project paths but not actually required to be searched and indexed  Press ALT CTRL S and search for project    3  Do memory sweeps There is another interesting feature   Go into the settings  File Settings  and search for memory  In IDE Settings gt Appearance -  tick Show memory indicator  A memory bar will be shown at the bottom right corner  see the picture below   Click this bar to run a garbage collection   memory sweep

User · Answer

In my case  it was very slow and i needed to change inspections settings  i tried everything  the only thing that worked was going from 2018 2 version to 2016 2  sometimes is better to be some updates behind

User · Answer

In my case  the problem was a folder in the project directory containing 300k  files totaling 11Gb  This was just a temporary folder with images results of some computation  After moving this folder out of the project structure  the slowness disappeared  I hope this can help someone  please check your project structure to see if there is anything that is not necessary

User · Answer

I thought I had a speed issue with PyCharm but in the end it turned out that the output console in PyCharm does not necessarily emulate the output of state-of-the-art terminal applications  Here s my solution  Click on drop down  arrow  symbol of your configuration - gt  click edit configuration - gt  click emulate terminal in output console - gt  click ok - gt  Run the configuration

User · Answer

It is super easy by changing the heap size as it was mentioned  Just easily by going to Pycharm HELP -  Edit custom VM option     and change it to   -Xms2048m -Xmx2048m

[pycharm] pycharm running way slow

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