> Never could figure out why, but maybe resharper has gotten better since then? R# runs in-process and has its own project system, language service, UI element

> Never could figure out why, but maybe resharper has gotten better since then? R# runs in-process and has its own project system, language service, UI elements, etc. That's simply a lot of stuff to do in the same process that also has the VS project system, language service(s), UI elements, etc. running. Both have added tons of features over the years, so over time it just slows down. The R# team is working to run it out of process, but it's an enormous amount of work. I suspect that VS 2022 (64-bit) will help with this compared to previous versions though.