@thelinuxcast Two things cause Nautilus to slow down massively, especially compared to other file managers.
First, the preview tech does a ton of stat calls, to work out what to show you. Disable it, and things get about 20% faster. They know about it, but no one has done a patch to fix it in over a decade, so I wouldn't be hopeful.
Secondly, the more bookmarks you have, the slower things get. Every time you open a folder it pings every single bookmark for some reason.