I have searched extensively and cannot find another person on the planet with this problem...
The symptoms are:In Visual Studio 2012, on a MVC 4.0 Project that was upgraded from VS2010 and is configured for dual version editing from VS2012 and VS2010. When I right-click on the Controllers Folder and select Add->Controller... from the context menu, I get an "Object reference not set to an instance of an object" error from Visual Studio.
The existing code in the project runs fine, and if I use the Add->New Item option instead, and pick the Controller from the dialog box, then I can add a blank controller. I just cannot add a typed controller using the method above.
If I however create a new MVC4 Project, then I can add typed controllers again using the same menu, so the problem does not exist in Visual Studio's installation, it has to exist in the Project File. I have also checked the references between my project and a new MVC Project and all the new project references are included in my project.Has anyone experienced something similar?How do I fix this?
The issue seems to have been caused by an incomplete install/registration of the MvcScaffolder package.
The following process resolved my issue for me.
Start Visual Studio and open the project. Open the Package Manager Console. (This was the "trick" or missing piece of information that led to the solution...)
Here I saw the following error caused by the PowerShell script used for registration:
New-Object : Could not load file or assembly 'System.Management.Automation, Version=3.0.0.0, Culture=neutral, PublicKeyToken=31bf3856ad364e35' or one of its dependencies. The system cannot find the file specified.
At <ProjectPath...>\packages\MvcScaffolding.1.0.9\tools\registerWithMvcTooling.ps1:163 char:27
+ $newProvider = New-Object <<<< $powerShellScaffolderProviderType($mvcScaffoldingProvider)
+ CategoryInfo : NotSpecified: (:) [New-Object], FileNotFoundException
+ FullyQualifiedErrorId : System.IO.FileNotFoundException, Microsoft.PowerShell.Commands.NewObjectCommand
When I checked the registered scaffolders from the Package Manager Console I got:
PM> get-defaultscaffolder
DefaultName ScaffolderName
Action MvcScaffolding.Action
Controller MvcScaffolding.Controller
CustomScaffolder T4Scaffolding.CustomScaffolder
CustomTemplate T4Scaffolding.CustomTemplate
DbContext T4Scaffolding.EFDbContext
Mailer Mailer.Razor
Repository T4Scaffolding.EFRepository
UnitTest MvcScaffolding.ActionUnitTest
View MvcScaffolding.RazorView
Views MvcScaffolding.Views
So clearly the scaffolders are configured to use the MvcScaffolding package, but the package had a registration error.
A quick search for the error provided this link http://mvcscaffolding.codeplex.com/discussions/437692 which refers to https://visioautomation.codeplex.com/discussions/397034 that suggests installing PowerShell 3, which is actually part of the Windows Management Framework 3.0, available from http://www.microsoft.com/en-us/download/details.aspx?id=34595. I picked the Windows6.1-KB2506143-x64.msu file when prompted because I’m running Win 7-64-bit.
Restart the PC after installation, re-open Visual Studio and the project and look at the Package Manager Console. If the error is gone, then so is the controller problem.
I had this problem on VS2012 on Win8, We where working on a project that we started developing on VS2010 and i wasn't able to create new controllers with the CTRL+M, CTRL+C shortcut.
Opening any project and re-installing MvcScaffolder and its dependencies under Manage Nuget package have fixed this for me.
Didn't have to restart VS2012 at all.
Maybe your existing project have wrong ProjectTypeGuids element in .csproj file?
Right one for MVC4 is {E3E379DF-F4C6-4180-9B81-6769533ABE47}.
Try to compare what project type do you have in new project and in your existing project.
The preferred answer of installing the Windows Management Framework 3.0 did not work. The download "Windows6.1-KB2506143-x86.msu" did not work on my Windows 7 32 bit system. It failed with the error "The update is not applicable to your computer".
Reinstalling MVCscaffolding with Manage Nuget Packages did not work.
My ProjectType GUID was correct.
Microsoft Web Developer Tools was already installed.
Deleting and recreating the solution didn't work.
It was necessary to repair the Visual Studio 2012 installation from the install disk to fix this issue.
Installing "Microsoft Web Developer Tools" fixed this for me. Related:
How do I open a csproj with ProjectTypeGuids 349c5851-65df-11da-9384-00065b846f21?
{E3E379DF-F4C6-4180-9B81-6769533ABE47} - MVC4 Project
{fae04ec0-301f-11d3-bf4b-00c04f79efbc} - CSharp Project
{349c5851-65df-11da-9384-00065b846f21} - Web Application Project (this is what you need web dev tools for)
The update Windows6.1-KB2506143-x64.msu worked for me. The problem started after a full SpyWare software scan. I think that it removes more things than the usual. So, back to normal life.
I had the same problem, im using database first, and it was because i have changed the .edmx contex.tt to generate the contex.cs with the connection name set to a custom method,
: base(sqlHelper.getMainConnectionString())
every time, before i change/update the .edmx, i need to change the connection name to it's creation defaults:
: base("name=YourWebconfigConnectionstringName")
rebuild the project and it works again
Answer:
Check your connectionstring string and provider parameters at the webconfig, then delete and recreate the .edmx this will force the generator to rebuild all the database objects, metadata included OR delete all tables in the designer, change the contex.cs to the default creation name, rebuild the project, add the tables, rebuild the project, it shoul work again.
This problem manifested on a target MVC5 project using VS2017.
Like the original op, a new project was attempted to perform an Add Controller with EF scaffolding against ApplicationUser. The error did initially manifest until a single user was registered forcing the database to be created. After that, add scaffolding worked without incident. I think this makes sense because the entity didn't really yet exist before the first registration, although I will stand corrected if someone more knowledgeable than myself has a more accurate explanation. But because Add Controller worked with a new project, just as the original op determined, it didn't seem to be a VS2017 installation problem. This pointed to something wrong with the taret project.
At this point in the target project an Undo All in Team Explorer was executed to get the project back to a previously working point. While this might be accomplished by getting a specific version, for this target project all that was required was an Undo All. A word of caution: in the case of this specific project, before undoing, the Package Manager was used to rollback the database to the starting point that would match with the Undo All. If one performs a get specific version, be sure to check if the database needs to get rolled back to the proper configuration. After resetting all the project changes, the object reference not set to an instance of an object error was no longer present during the Add Controller operation, fixing the error within the target project.
I post this response somewhat reluctantly because I am unable to duplicate the error, and I am unsure of what actually caused the problem in the first place, but this is a particularly nasty error if one is in the middle of a project and Add Controller starts failing. I figured if someone has this problem and rolling back the current change set might fix it for them, like me they will be thankful. If I later determine the pattern of activity that caused the problem to crop up in the first place, I'll surely add more to this post.
I'm running VS 2019 Enterprise, ASP.NET Core 3.1.3.
I was trying to add MVC controller with views using Entity Framework (EF) after scaffolding in database first approach.
I run on this issue because one of the tables in my ER model was missing primary key.
That table was connected to table for which I tried to generate MVC controller through another table that has primary key so I didn't noticed initially that error.
I'm at wit's end. Visual Studio is typically painfully slow to debug or just plain load ("start without debugging") 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 slowly 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: "Contact", "Location", and "StatusCode". It appears that IIS is loading symbols twice for each time the display template gets called. Thus, if I'm displaying a table of 100 entries that call all three of these display templates, it's 600 separate symbols loaded.
This isn't a fast operation either. The log files that IIS generates take 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/ 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 horsepower. The infuriating thing is that the same project, with NOTHING altered, can sometimes load very quickly, typically after I repair IIS Express and delete the My Docs\IISExpress folder. Eventually, "something" 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 add-ons whatsoever.
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 "loaded symbols" 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 display template 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, then somehow stamps a new time on it, and Visual Studio then thinks the file has changed. Thus, Visual Studio recompiles it yet again. Only a theory though; I really have no clue.
For one, apparently, I have offline files (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 to load.
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.
Turning off intelliTrace fixed this for me.
In Visual Studio, Tools -> Options -> IntelliTrace
Then, uncheck the checkbox for "Enable IntelliTrace".
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.
I deleted the "Temporary ASP.NET Files" folder and my localhost page load improved dramatically. Here is the path... %temp%\Temporary ASP.NET Files\
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
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).
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 & 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.
The above are all good solutions and I tried all of them, but got the solution here, which is to
Debug -> Delete All Breakpoints
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.
For me, I implemented this tip which basically drastically improved performance by adding the following two attributes to compilation tag in web.config
<compilation ... batch="false" optimizeCompilations="true"> ... </compilation>
What does batch="false" 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="true"), 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
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
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
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.
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.
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.
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.
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.
My slow VS issue was resolved by disabling the Browser Link
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.
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.
Emptying the symbol cache worked for me.
See: menu bar / Tools / Options / Debugging / Symbols / Empty Symbol Cache
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).
to Clear cache etc. use Options 1 & 2; for settings/troubleshooting Options 3 & 4, enjoy!
Option 1: Navigate to IIS express , clear cache and sites
cd "C:\Program Files (x86)\IIS Express\"
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> rmdir C:\Users\\{username}\AppData\Local\Microsoft\WebsiteCache /s /q
Cmd> 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 > Options (or Debug > Options) > Debugging > 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 -> General
Uncheck “Automatically adjust visual experience based on client
performance”
Uncheck “Enable rich client visual experience” Check
“Use hardware graphics acceleration if available”
Environment -> AutoRecover
Uncheck “Save AutoRecover information every”
Environment -> Documents
Check “Save documents as Unicode when data cannot be saved in codepage”
Environment -> 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 -> Startup
Set “At startup” to “Show empty environment at startup”
Uncheck “Download content every”
Environment -> Synchronized settings
Uncheck “Synchronize settings across devices when signed into Visual Studio”
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&MSPPError=-2147217396
Returning back the default JIT debugger (just checked Managed option that was unchecked) solve all my problems.
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.
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.
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.
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.
For me it was conditional breakpoints. Those seem to really slow things down.
Go to your environment variables and look for the key _NT_SYMBOL_PATH.
Delete it.
Voila, worked like a charm.