I also bought new hardware - and noticed no real improvement (something about a fundamental threading problem, I think).
About 6 months ago I was finally fed up and just accepted I would be slower and less productive in some areas for a while without ReSharper, but that it would be OK.
I still miss features from it on a daily basis, but overall I am now quite happy with vanilla VS2019/22 - and never want to go back to the lag-hell that is ReSharper.