Visual Studio 15 update 3 IntellIsense works slows down or lags and loads the processor up to 100%

Question

Good day!

when working in VISUAL STUDIO 15 update 3 when writing code, namely the IntelISense component - when adding or prompting - the processor is loaded up to 90-100% - + and a lag or delay occurs.

Windows server 2016 10.0.14393 updated
Visual Studio 15 update 3
VM 4 cores, 8gb of ram ()

previously added 16 GB of RAM - to exclude swapping, it did not help - there is no difference. Test server - to solve this problem

Server uses application and database MSSQL 17 community
server load is minimal - loads only when working in visual studio

How to fix it ?

sorry my bad english

Answer 1

Hi @Alexandr Kim ,

Welcome to Microsoft Q&A forum.

This issue may be caused by many possible reasons, such as hardware, platform, extensions, potential issues, complex settings and so on. Perhaps we need to first check if this issue appears in a specific project, some specific codes or this issue appears in every newly created projects on your side.

If this issue appears only in this project, then the issue should be related to this project instead of the whole VS IDE(of course, we need to consider if this is a potential issue). Not sure, what programming language you are using and what kind of projects you are using, since programming language and some other mechanism are different, the intellisense may be slower than in other projects, generally the waiting time will not be too long. But apparently the processor loaded up to 90-100% is not this issue, so, did you change some configurations before? Or did you install and use some third-party extensions? I may need to say that sometimes anti-virus software or firewall may affect VS too. So if possible, please try to temporarily disable any third-party extensions from Tools > Extensions and Updates > Installed > Disable > restart VS, and also try to disable the anti-virus software and firewall to test again.

I suggest you try to start VS under safe mode to avoid the impact from other extensions. You can use this command: devenv /SafeMode in CMD and remember to cd into the directory where Visual Studio 2015 locates. Another way you can try is reset VS settings, and remember to select “General” at step 4.(it is recommended to export your current VS settings first and then reset it)

Besides, are there any other processes that occupy the processor(check from Task Manager)? If possible, you can also try to reboot your machine.

BTW, here are some other tips for improving performance of VS.

Best Regards,
Tianyu

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