I run Emacs on both Linux and Windows and I find that with more or less the same packages, the Windows Emacs tends to "slow down" after a while. I've used the profiler to track down a couple of things that were causing slowdowns (ibuffer auto refresh, etc), but still haven't quite go to the point where Windows runs as fast as Emacs. On both cases I have fairly long running Emacs sessions - around a month on Linux, when I pickup distro updates, and a week on Windows as we do mandatory reboots weekly. I recommend you try profiling to see if something shows up [1].

[1] https://200ok.ch/posts/2020-10-01_introduction_to_profiling_...