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I'm working with the community edition of VS2017. Version 15.2(26430.14) which is the latest update as of 07/Jul/2017. Intellisense is sporadically slow, and stops normal progress of my coding effort. It seems to "wake up" after about a 10 to 20 second wait. But today, it crashed, and the activity log showed this information. 

 <entry>
<record>1709</record>
<time>2017/07/06 00:17:33.497</time>
<type>Error</type>
<source>Editor or Editor Extension</source>
<description>System.InvalidOperationException: Cannot Match.  The session is dismissed.&#x000D;&#x000A;   
at Microsoft.VisualStudio.Language.Intellisense.Implementation.CompletionSession.Match()&#x000D;&#x000A;  
at Microsoft.VisualStudio.Language.Intellisense.Implementation.CompletionSession.OnViewBuffer_Changed(Object sender, TextContentChangedEventArgs e)&#x000D;&#x000A;  
at Microsoft.VisualStudio.Text.Utilities.GuardedOperations.RaiseEvent[TArgs](Object sender, EventHandler`1 eventHandlers, TArgs args)

At the time I was editing XAML and adding a Binding to the IsOpen property of a ContextMenu. After closing the editor and reopening, it worked fine...

I've removed all Plug-ins but Code Maid, which I'll try next. However, I'm looking for suggestions to this hiccup.

JWP
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3 Answers3

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I had a similar problem. I closed Visual Studio and deleted the .vs (hidden) folder and restarted. It automatically regenerated the folder.

Chet
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  • Chet, where is that folder located? – JWP Jul 06 '17 at 00:58
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    Inside the solution folder. – Chet Jul 06 '17 at 00:58
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    The solution above works but only for a short time, although Intellisense times are better they're still not what they should be... Intellisense should not affect performance while coding.... in my opinion. – JWP Jul 06 '17 at 15:55
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I had an issue with this as well. See Link (https://support.microsoft.com/en-us/help/2894215/you-experience-performance-issues-product-crashes-or-rendering-issues)

It looks to be an issue with some display drivers causing issues. The recommended workaround is to disable hardware acceleration for VS2017. I did this and it fixed my issues. Intellisense is now working as fast as I can type.

I have attached a screenshot from the link for the workaround just in case the link becomes dead.

Intellisense Workaround

Nathan
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  • For me it was just disabling the automatic adjusting. Whether it uses GPU or not, now id does not seem any different. Working on gaming pc. – Y.A.P. Jan 07 '21 at 08:51
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The root cause of this problem was the new version of CCleaner Cloud Edition. Once I removed this software the problem all intellisense slowness and crashes ceased!

JWP
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