Visual Studio debugging loading very slow

Question

I m at wits end  Visual Studio is typically painfully slow to debug or just plain load   quot start without debugging quot   my ASP NET MVC sites  Not always  at first  the projects will load nice and fast  but once they load slow  they ll always load slow after that  I could be waiting 1-2 minutes or more  My setup  I m using Visual Studio 2012 Express  currently  but I ve had the same problem in Visual Studio 2010 Express as well  My solution is stored on a network drive  specifically  it s My Documents redirected to a network drive  if it matters   It shouldn t  There are times where my site loads very fast under this setup   I load in Internet  Explorer 9 usually  but the same problem happens in Firefox  This can happen in any ASP NET MVC project I work on  and it seems to revolve around having DisplayTemplates  which all my ASP NET MVC projects do  And it s all C  and Razor  if that mattered  Symptoms  The system will load my symbols hundreds of times  Basically  the following  but there are at least 300 such rows  each with ever-so-slightly different DLL files for the same CSHTMLs   iisexpress exe   Managed  v4 0 30319    Loaded  C  Windows Microsoft NET Framework v4 0 30319 Temporary ASP NET Files root b63f8236 6775085d App Web contact cshtml 22013bb9 xighmhow dll   Symbols loaded   iisexpress exe   Managed  v4 0 30319    Loaded  C  Windows Microsoft NET Framework v4 0 30319 Temporary ASP NET Files root b63f8236 6775085d App Web contact cshtml 22013bb9 cv5hktkf dll   Symbols loaded   iisexpress exe   Managed  v4 0 30319    Loaded  C  Windows Microsoft NET Framework v4 0 30319 Temporary ASP NET Files root b63f8236 6775085d App Web statuscode cshtml 22013bb9 1o77hs8i dll   Symbols loaded   iisexpress exe   Managed  v4 0 30319    Loaded  C  Windows Microsoft NET Framework v4 0 30319 Temporary ASP NET Files root b63f8236 6775085d App Web statuscode cshtml 22013bb9 jja-77mw dll   Symbols loaded   iisexpress exe   Managed  v4 0 30319    Loaded  C  Windows Microsoft NET Framework v4 0 30319 Temporary ASP NET Files root b63f8236 6775085d App Web location cshtml 22013bb9 l e9ev s dll   Symbols loaded   iisexpress exe   Managed  v4 0 30319    Loaded  C  Windows Microsoft NET Framework v4 0 30319 Temporary ASP NET Files root b63f8236 6775085d App Web location cshtml 22013bb9 b4n59gom dll   Symbols loaded   In the above  I ve got three DisplayTemplates   quot Contact quot    quot Location quot   and  quot StatusCode quot   It appears that IIS is loading symbols twice for each time the displaytemplate gets called  Thus  if I m displaying a table of 100 entries that calls all three of these displaytemplates  it s 600 separate symbols loaded  This isn t a fast operation either  Looking in the log files that IIS generates  it takes about 200  ms for each symbol to load  Thus  super-long delays  What I ve Tried   Debug or Release version  it doesn t matter  Putting my project on a full IIS implementation on a web server runs it super fast with no problems  Cassini  IIS  Express 7 5  and IIS  Express 8 0 all have the problem  Delete All Breakpoints does nothing  Clean Solution  or deleting the  suo also do nothing  If I repair IIS  Express  or delete the My Docs IISExpress folder  or repair reinstall Visual Studio   the issue MAY go away  but only for a while  before it comes right back   Any advice at all is appreciated  To answer more questions  yes my machine definitely has the horsepower  The infuriating thing is that the same project  with NOTHING altered  can load very very quickly sometimes  typically after I repair IIS  Express and delete the My Docs IISExpress folder  Eventually  quot something quot  happens and it s down to 2 minutes to load again  What I m working on is not a complicated project  No external libraries or dependencies  and my VS NET has no addons what-so-ever  Of note  this machine has Symantec Endpoint Protection  which has a history of causing havoc  But disabling it outright  it s good to be an administrator  did not fix the problem  I have a theory at this point  I m thinking this is all because I m working off a redirected folder off a network share  While the debugger was going through its hundreds of  quot loaded symbols quot  lines  I paused to see what it was doing  It was in my code  loading the DisplayTemplate I had  Stepping into the template output this  Step into  Stepping over non-user code  System Threading WaitHandle InternalWaitOne  Step into  Stepping over non-user code  System Threading WaitHandle WaitOne  Step into  Stepping over non-user code  System CodeDom Compiler Executor ExecWaitWithCaptureUnimpersonated  Step into  Stepping over non-user code  System CodeDom Compiler Executor ExecWaitWithCapture  Step into  Stepping over non-user code  Microsoft CSharp CSharpCodeGenerator FromFileBatch  Step into  Stepping over non-user code  Microsoft CSharp CSharpCodeGenerator System CodeDom Compiler ICodeCompiler CompileAssemblyFromFileBatch  Step into  Stepping over non-user code  System Web Compilation AssemblyBuilder Compile   iisexpress exe   Managed  v4 0 30319    Loaded  C  Windows Microsoft NET Framework v4 0 30319 Temporary ASP NET Files root b63f8236 6775085d App Web statuscode cshtml 22013bb9 bciuyg14 dll   Symbols loaded  Step into  Stepping over non-user code  System Web Compilation BuildManager CompileWebFile  Step into  Stepping over non-user code  System Web Compilation BuildManager GetVPathBuildResultInternal  Step into  Stepping over non-user code  System Web Compilation BuildManager GetVPathBuildResultWithNoAssert  Step into  Stepping over non-user code  System Web Compilation BuildManager GetVirtualPathObjectFactory  Step into  Stepping over non-user code  System Web Mvc BuildManagerWrapper System Web Mvc IBuildManager FileExists  Step into  Stepping over non-user code  System Web Mvc VirtualPathProviderViewEngine GetPathFromGeneralName  Step into  Stepping over non-user code  System Web Mvc VirtualPathProviderViewEngine FindPartialView  Step into  Stepping over non-user code  System Web Mvc ViewEngineCollection Find  Step into  Stepping over non-user code  System Web Mvc ViewEngineCollection FindPartialView  Step into  Stepping over non-user code  System Web Mvc Html TemplateHelpers ActionCacheViewItem Execute   iisexpress exe   Managed  v4 0 30319    Loaded  C  Windows Microsoft NET Framework v4 0 30319 Temporary ASP NET Files root b63f8236 6775085d App Web statuscode cshtml 22013bb9 kwj3uqan dll   Symbols loaded  Step into  Stepping over non-user code  System RuntimeType CreateInstanceSlow  Step into  Stepping over non-user code  System Web Mvc DependencyResolver DefaultDependencyResolver GetService  Step into  Stepping over non-user code  System Web Mvc BuildManagerViewEngine DefaultViewPageActivator Create  Step into  Stepping over non-user code  System Web Mvc BuildManagerCompiledView Render   It looks like Visual Studio is recompiling my displaytemplate every time it s called  which is again  hundreds of times  My theory is that Visual Studio compiles the file  saves it to the network share  the network share then somehow stamps a new time on it  and Visual Studio then thinks the file has changed and thus Visual Studio recompiles it yet again  Only a theory though  I really have no clue  For one  apparently I have offline files on  this is a desktop computer in an office  I couldn t care less   I m going to disable  reboot and retry tomorrow  Plus  moving my project  as is  to the local C  fixes it  It loads very quickly  But this is not ideal in a work environment  I lose Previous Versions  my code isn t backed up at all unless I manually copy it  and it s no longer shared with anyone  I can make do with copying it back and forth from C to the network share  if it comes to it  It s much more annoying to wait two minutes for every page load

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The above are all good solutions and I tried all of them  but got the solution here  which is to   Debug - gt  Delete All Breakpoints

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Here is how I solved the  slow symbol loading  problem in Visual Studio 2012    Go to Tools -  Options -  Debugging -  General CHECK the checkmark next to  Enable Just My Code   Go to Tools -  Options -  Debugging -  Symbols Click on the       button and create select a new folder somewhere on your local computer to store cached symbols  I named mine  Symbol caching  and put it in Documents -  Visual Studio 2012  Click on  Load all symbols  and wait for the symbols to be downloaded from Microsoft s servers  which may take a while  Note that Load all symbols button is only available while debugging  UNCHECK the checkmark next to  Microsoft Symbol Servers  to prevent Visual Studio from remotely querying the Microsoft servers  Click  OK     From now on  symbol loading should be much faster    Note that if you make any changes downloads to Microsoft assemblies  you may need to go back into the Symbols dialog box and  Load all symbols  again

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In my case it was   Tools Options Debugging General Enable JavaScript debugging for ASP NET  Chrome and IE    Once I unchecked this  my debug start went from 45-60 seconds down to 0-5 seconds

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I experienced the same problem and tried most of the resolutions above  Simply deleting cache and temp files end up working for me   Try removing the contents of these two folders   C  Users   UserName  AppData Local Microsoft WebsiteCache   and  C  Users   UserName  AppData Local Temp  in particular the iisexpress and Temporary ASP NET Files folders    This can be set up to happen automatically on logging on to Windows by adding a cmd file to the C  Users   username  AppData Roaming Microsoft Windows Start Menu Programs Startup folder with the following content   rmdir C  Users   username  AppData Local Microsoft WebsiteCache  s  q  rmdir C  Users   username  AppData Local Temp  s  q

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As title says  VS debugging is slow  I can t find my problem  so post it here  may be it helps someone   In my case slow debugging was on the website hosted in IIS    VS 2019  16 4 4   VS 2017  15 9 19  Windows 10  1909  IIS  10 0 18362 1  Edge  44 18362 449 0    At first time after site loading it works fine  but after 1  minute it become lagging  Requests are pending for 1-2 minutes  F12 network tab  before my breakpoints can handle them  It was in all my active browsers   Solution  Do not use Edge with IIS while debugging   To understand where the problem i spent about 4-5 hours  I used Edge   Chrome for my workflow  For now i use only Chrome  with separated user profiles    Link that helped me  https   answers microsoft com en-us windows forum all iis-running-very-slowly-after-windows-10-upgrade dae433ba-4efe-45ab-aa66-824e6fa92b51  J Marcos  answer

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None of this worked for me but I found a Breakpoint on a symbol that was deleted  Seems 2010 was hanging on it  To see if this is your issue do debug- windows- breakpoints If any are in there just delete them   Saunders  mentioned he checked for that but it was not mentioned in the solutions for this problem  Maybe common knowledge for some  but not all of us

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Restart your computer  I know it sounds far too simple but it was the only thing that worked for me

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My solution was simply to reload a saved GOOD  backup  copy of my settings  made a year ago   Worth trying before resetting everything to blank  My VS2010 would take 60 seconds to start debugging and approx  3 minutes to stop debugging  I saved the corrupted settings and to my surprise they were over 3MB instead of 260Kb  I loaded the good backup copy and everything is great again  -

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I had execution perfomance troubles with debugging too and i tried very many options of debugger  In my case huge perfomance achieved when i change this options   Tools - Options - Debugging - Output Window -  General output settings - All debug output  - OFF

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My problem was due to the project being built each time I started debugging  All other solutions in this thread helped slightly  but still resulted in me having to wait until project finished building  My Solution to avoid the build each time you start debugging   Go to  Solution Explorer -  gt  Right Click Your Solution File -  gt  Click Properties  In the Property Pages -  gt  On the left  choose Configuration  -  gt  and Uncheck Build  Click OK  Ensure you have visual studio open as Administrator  Go to Debug - gt  Attach to Process  CLICK checkbox Show processes from all users - gt  Find and Select process called w3wp exe - gt  Click Attach - gt  when warning comes up  click Attach   Now you can navigate to the page you are wanting to debug in localhost  and if you have break points set in your file  you can immediately begin debugging without having to wait for your project to build

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Go to your environment variables and look for the key  NT SYMBOL PATH   Delete it   Voila  worked like a charm

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One thing that worked for me after doing all the above was  In the Threads window  Debug- Windows- Threads   set Group by to None  This can only be done while debugging   This was having an impact even after closing that window

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Emptying the symbol cache worked for me    See  menu bar   Tools   Options   Debugging   Symbols   Empty Symbol Cache

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This might help someone  I had the same issue and found out that i had SD card with drive e   After removing my SD card the problem was fixed

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I think I may finally at least know the cause  though not the reason why  When the problem started occurring again  I noticed a ton of  conhost exe  processes orphaned  I would close Visual Studio and they would remain open  Ending task on each of them has finally  reliably solved the problem   hopefully    Just note  conhost exe isn t a Visual Studio process though Visual Studio uses it  Thus  other users out there may have other applications out there that run conhost exe  I know my machine doesn t which is why I can safely end task all of them but YMMV    As to why this happens  It seems to occur when I open more than one project at once  which I tend to do often  even though I only build and debug one of them at any time     Edit  1 - This isn t a  silver bullet  unfortunately  It doesn t always work for me  Typically  when things get slow  I just close all of my Visual Studio sessions  then go into the task manager and end any instance of it  conhost exe  iisexpress exe Microsoft VisualStudio Web Host exe and MSBuild exe I can find   Typically  after that  when I restart my project it ll then load quickly  But not always   Really I think the best course of action is probably to not build  amp  debug code off a redirected folder network share     Edit  2 - Two years later  and this is still an issue for me in Visual Studio Community 2013  but I did seem to at least find the culprit task  Explorer exe  Yeah  who knew  The moment I end that task  bam  page loads in a single second   If I have a Windows Explorer file browser open to my redirected network drive  which is often since that s where my code is   this problem seems to occur  Closing the window isn t enough  I have to kill the whole Explorer exe task  I could only guess what it s doing   going nuts with file handles   I can usually use the task manager to start up a new explorer exe task  I can only take so much alt-tabbing   and Visual Studio will continue to load nice and quick  But if I so much as open Windows Explorer again  it almost always goes back to super-slow-mo   So  if you ve got a redirected network share  give it a shot  It sure beats working locally

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I had accidentally selected the option  Show Threads in Source   On unselecting stepping through the code was normal

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For me it was conditional breakpoints  Those seem to really slow things down

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Please make sure you haven t opened Visual Studio in administrator mode  I faced this issue and had to run in normal mode

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If someone notices this behavior coming out of left field  check to make sure you don t have any breakpoints set in web config   I must have set one with a stray mouse click  and it really slowed down all debug operations

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I deleted the  Temporary ASP NET Files  folder and my localhost page load improved dramatically  Here is the path     temp  Temporary ASP NET Files

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One time  after a power outage  I had to face the same slowness problem each time a breakpoint was hit or a Exception was thrown   I had the vague remembering that the  suo  file  in the same directory as the  sln  solution file  can be corrupted and make everything slow down     I deleted my  suo  files and everything was ok  The  suo files deletion is harmless and only implies to recreate my windows layout plus the starting project and a few other non critical customizations

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To clear cache etc  use Options 1  amp  2  For settings troubleshooting Options 3  amp  4  enjoy  Option 1  Navigate to IIS express   clear cache and sites  cd  quot C  Program Files  x86  IIS Express  quot     run this appcmd exe list site  xml   appcmd delete site  in run this Del  S  F  Q  temp  - to clear the Userprofile Temp folder  run this Del  S  F  Q  Windir  Temp  Also  clear your temp files in  temp  and logout  or reboot this clears the Windows temp folder  This will delete all the sites  enjoy   Option 2  remove recreate the temp folders  Cmd gt  rmdir C  Users   username  AppData Local Microsoft WebsiteCache  s  q Cmd gt  rmdir C  Users   username  AppData Local Temp  s  q   Option 3  JMC  Just My Code  Option from MSDN To enable or disable Just My Code in Visual Studio  under Tools  gt  Options  or Debug  gt  Options   gt  Debugging  gt  General  select or deselect Enable Just My Code    Option 4  configure the Visual Studio Disable Common plugin issues Even more Visual Studio settings You can also configure the Visual Studio and disable resource-killing features on the environment  cant remember where I got this  but threes some more I will post shortly  Environment - gt  General  Uncheck    Automatically adjust visual experience based on client performance    Uncheck    Enable rich client visual experience    Check    Use hardware graphics acceleration if available    Environment - gt  AutoRecover Uncheck    Save AutoRecover information every    Environment - gt  Documents Check    Save documents as Unicode when data cannot be saved in codepage    Environment - gt  Keyboard Set    ForceGC    to ctrl num1 Set    ReSharper Toggle    to ctrl num0  if ReSharper is used  Set    ReSharper EnableDaemon    to ctrl num8  if ReSharper is used  Environment - gt  Startup Set    At startup    to    Show empty environment at startup    Uncheck    Download content every    Environment - gt  Synchronized settings Uncheck    Synchronize settings across devices when signed into Visual Studio

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Each time I recompiled to local host while developing it took several minutes   It was terribly frustrating   After trying umpteen fixes including putting it all on an SSD  I found what really worked   I created a ramdisk and put the whole project in it  Recompiles to local host are now under ten seconds   Perhaps not elegant but it really worked

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The problem for me was the  Browser Link  feature that is very heavy when you have several tabs open for the same project    Because every time we launched the project  it opens a new tab with browser link communications   Just close all tabs associated with the project and keep only one open     This free instantaneously visual studio   It   s magic    -         Browser Link is a feature since Visual Studio 2013 that creates a communication channel between the development environment and one or more web browsers  You can use Browser Link to refresh your web application in several browsers at once  which is useful for cross-browser testing

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My slow VS issue was resolved by disabling the Browser Link

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I was having this problem with VS 2013   For months my tests had been debugging fine  but suddenly the dreaded Loading symbols messages were appearing  and I wasn t aware of anything I d done to cause it   Nothing suggested here or on any other internet page helped me   I tried everything at least 10 times  Deleting the  suo file didn t help  but in the same location were two files with  testsettings extension and one with  vsmdi extension   These files appeared to be obsolete  perhaps a relic from VS 2010   The team member who d created them was long gone   I found that I could delete all three of these files without a problem   I figured out that it was enough to just remove a particular one of the  testsettings files to stop the Loading symbols messages   My nightmare is over

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After spending all day waiting for symbols to load as slow as turtle speed  mixing and switching between all the possible combinations  Just My Code  Caching symbols  Intellitrace  Just-In-Time  killing processes  etc   My solution was actually to disable the antivirus  Yeah  Windows Defender was slowing my project launch  It would check all the dlls as Visual Studio requested them and slowed the whole symbol load process   I have to say our machines have great specs to compile the solution really fast  so that was never a problem  We code in VS 2013 Ultimate

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In my case  it was the  NET Reflector Visual Studio Extension  version 8 3 0 93  with VS 2012  Debugging was taking 10 seconds for each Step Over  F10    In Visual Studio  go to Tools Extensions and Updates    and disable the  NET Reflector Visual Studio Extension  Don t forget to restart Visual Studio

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Asp net core debugging was painfully slow because of unknown VS extension had replaced default Just in Time debugger   I have found such message in the OPTIONS DEBUGGING Just-In-Time configuration tab  as warning text   Another debugger has registered itself as the Just-In-Time debugger  To repair  enable Just-In-Time debugging or run Visual Studio repair   Description  https   msdn microsoft com en-us library ssc8234s aspx f 255 amp MSPPError -2147217396  Returning back the default JIT debugger  just checked Managed option that was unchecked  solve all my problems

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Turning off intelliTrace fixed this for me    In Visual Studio  Tools -  Options -  IntelliTrace  Then  uncheck the checkbox for  Enable IntelliTrace

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A quick and easy solution for those who don t have much deviation from default VS settings   Tools-- Import and Export Settings-- Yes  save my current settings-- Visual C   I am sure the above solution would work with other default settings too  In my case something messed up with my symbol loading settings but I could not fix it even though I tried quite a few of the suggested solutions

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I don t know if you re still having this issue  but I debug sites in Visual Studio by attaching the debugger to the process itself rather than letting VS do it for me and I have found it to greatly improve times   I use an extension for VS called AttachTo and I have a small article on how I use it here    I hope this helps

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There is also complications in partial views where there is an error on the page that is not recognized immediately   Like Model SomeValue instead of Model ThisValue   It might not underline and cause problems in debugging   This can be a real pain to catch

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In Visual Studio   Tools -  Options -  Debugging -  Symbols  Choose  Only specified modules    Click the  specify modules  link  and add a blank module  click the new document button and hit OK

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Your  My Documents  folder mapped to a network share   Startup of IIS Express can take minutes instead of seconds if this is the case even if your solution is local instead of on the network share  In regedit exe  verify that HKEY CURRENT USER Software Microsoft Windows CurrentVersion Explorer User ShellFolders Personal is pointing to  USERPROFILE  My Documents    If it s not  change it or ask your network admin to make an exception to your policy

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Do you have enabled FusionLog   My VisualStudio was very slow to start  open solution and load symbols when start debugging  It was slow only on my machine  but not on other machines   FusionLog writes tons of log stuff to disk  Just disabling it on RegEdit solved everything  on my case   This is the FusionLog key on registry   HKEY LOCAL MACHINE SOFTWARE Microsoft Fusion   Check ForceLog value  1 enabled  0 disabled

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Yet another possible cause is pre-compilation of old projects that exist on the file system but have been removed or partially removed from visual studio     I had a solution that was taking 3 5 minutes to load after a build  I had a look at the timestamps in Temporary ASP NET Files and saw that the 3 minute delay was on a file in an old project   Had a look in VS  amp  the project was  unavailable    Deleted it from VS  deleted from the file system  and now we re down to a sweet 8 seconds

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For me the problem was Avast Antivirus  I uninstalled it and ran with Windows Defender instead and everything works fine  In my solution I only had this problem when running Windows applications  either WinForms or WPF  It was never slow on web applications for some reason

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I was also facing this issue  below are the steps that I perform and it works for me always    Deleting the solution s  suo file  Deleting the Temporary ASP NET Files   You can find it at find it at  WINDOW  Microsoft NET Framework  Temporary ASP NET Files   Deleting all breakpoints in the application

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I had problems with slow Visual Studio debugging when  Native Code  debugger was enabled  Try disabling it   On  Visual Studio 2012  go to    Project Properties -  Web -  Debuggers  bottom of page   -   Disable all except ASP NET   Hope it helps   Similar questions  1  2

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Another last resort solution with respect to time is to repair the VS installation    Go to Tools    Get Tools and Features Locate the existing VS installation  and choose repair under the more button    For example  Visual Studio Enterprise 2019 installation

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Open the solution folder in windows explorer  close the visual studio  delete  suo file from windows explorer   Now open the project in visual studio  hopefully debugger will attached detached fastly

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I set up my Visual Studio in a new job with C  as the default language  It hadn t yet dawned on me that I was doomed to be programming in VB   I forgot about the C  default because VB seemed to work fine  However  stepping through code was taking a ridiculous amount of time  After trying a number of fixes  in desperation I changed the default language to VB    bingo   If you ve got down this far  it s definitely worth a try

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Deleting  vs folder inside solution folder fixed the slowness for me in VS2019

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For me it was IE 9 08 8112 16241   As soon as I used Firefox or Chrome there was no sluggish debugging with F10 or F11   I do not know what the problem with IE is but I officially despise using it for testing now  Update  I have turned off all IE program add-ons and it is back to full speed   Turning them on one at a time revealed that LastPass  in my case  was the culprit   I guess I do not get to blame MS after all  Several years into the future    If you are using Brave you can easily access your extensions and turn them off one at a time  or several  while debugging  brave   extensions  Just click the toggle slider   Notice that all of mine are on except for DuckDuckGo Privacy essentials   They are not removed  just temporarily disabled

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In my case the problem was an external running exe file - namely   WUDFCompanionHost exe   under the name of    Windows Driver Foundation - User-mode Driver Companion Framework Host Process     Process  which has taken a steady 10  of the CPU   Killing it helped directly and withing a second the page has loaded

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For me it was that I was debugging in Managed Compatibility Mode  In Tools -  Options -  Debugging -  General at the bottom  un-check  Use Managed Compatibility Mode   Debugging became instantaneous where it used to take up to a minute to step through one line  I suspect that s what the  Managed  means in OP s snippets above   More on that here  https   blogs msdn microsoft com visualstudioalm 2013 10 16 switching-to-managed-compatibility-mode-in-visual-studio-2013

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In my case    I realized that remote debugging runs and consumes most of the resources  I did not really need to make the app 64 bit so after forcing it to be 32 Bit  remote debugging did not run and the execution was faster

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For me  I implemented this tip which basically drastically improved performance by adding the following two attributes to compilation tag in web config  lt compilation     batch  quot false quot  optimizeCompilations  quot true quot  gt       lt  compilation gt   What does batch  quot false quot  do   It makes pre-compilation more selective by compiling only pages that have changed and require re-compiling  What exactly is the optimizeCompilations doing  Source  ASP NET uses a per application hash code which includes the state of a number of things  including the bin and App Code folder  and global asax  Whenever an ASP NET app domain starts  it checks if this hash code has changed from what it previously computed  If it has  then the entire codegen folder  where compiled and shadow copied assemblies live  is wiped out  When this optimization is turned on  via optimizeCompilations  quot true quot    the hash no longer takes into account bin  App Code and global asax  As a result  if those change we don t wipe out the codegen folder   Reference  Compilation element on MSDN

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I finally fixed  or at least  improved a lot  this problem by making this changes in the local IIS configuration    Open IIS configuration Click into applications pools Right click into each pool and open advanced configuration Make sure that  Enable 32 bits apps  is set to TRUE  and Startup mode is set to AlwaysRunning   Hope this helps someone  because I was starting to go crazy trying to fix the slow debug problem

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In my case I noticed that disabling my internet connection would make it run as fast as with ctrl-f5  so I went to debug- options- symbols and just unchecked all  pdb locations   Seems like VS was trying to connect to these servers every time a debug session was launched   Note that disabling Debug- Options- Debugging- General  Enable source support  or  Require source files to exactly match the original version  wouldn t make any difference

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Similar problem wasted better half of my day   Since solution for my problem was different from whats said here  I m going to post it so it might help someone else   Mine was a breakpoint  I had a  Break at function  breakpoint  i e instead of pressing F9 on a code line  we create them using the breakpoints window  which is supposed to stop in a library function outside my project   And I had  Use Intellisense to verify the function name  CHECKED   Info here    This slowed down vs like hell  project start-up from 2 seconds to 5 minutes    Removing the break point solved it for good

[asp.net-mvc] Visual Studio debugging/loading very slow

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