I’ve had a lot of problems with IntelliSense slowness and lag in my VS 2019 (16.8.2). After trying to determine what could be the issue and trying out various things I’ve finally came across few posts which describe the same issues that I have (slow navigation through intellisense popup list, slow auto-complete).


The problem is that my monitor refresh rate (144Hz) seems to affect visual studio intellisense.
Here is more information:
https://github.com/dotnet/roslyn/issues/43314
https://developercommunity.visualstudio.com/content/problem/961285/intellisense-scrolling-list-via-a-keyboard-is-lagg.html?childToView=1076792#comment-1076792
The workaround (at least for me) is to open a VS solution (.sln) via double-clicking and not through Start page or Open project/solution dialog.
I’m just sharing this here in case someone else has similar problems.
I am so glad I seen this post. I’m not going crazy after all.
I know right. I knew something was going on.
What? This is weird.
I noticed this as well, I would have NEVER made this connection….
Interesting, if someone asked me do to that on purpose I would not know where to start.
Laughs in poor
Don’t underestimate the power of weird code…
VS Community 2019 user with 165 hz Monitor here. Can confirm these issues as well as the workaround.
I can confirm that this issue is 100% real. I don’t know how long I’ve been experiencing it, but I just assumed that VS 2019 was slower with intellisense for some reason.
The workaround (opening from File Explorer) is a night and day difference for me too.
C# devs
null reference exceptions

source