I've the same problem here.
Always on 20% CPU usage, started at last update.
Tried Evernote installed from Windows Store and website.
Tried Remove Evernote, erase synced cache and reinstall.
Evernote 10.52.8
Windows 11 22H2 (22621.1105)
Hope for a solution, because this is very annoying and make me considering another note app.