I don’t know about others, but I experienced the same problem and in my case it was because of the Minimal theme and Minimal settings - as soon as I switched to another theme, all problems were gone and Obsidian is super speedy now (I hoped that a “minimal” theme would be, well, minimal, yet for some reason it slows down like crazy with some CSS snippets & basic plugins)
So before disabling plugins one by one to identify the cause like I did to no avail, maybe try switching theme and see if that’s the problem to begin with? 