I updated Evernote to 10.22.3 today and noticed the same phenomenon.
Since this update, while Evernote is open, I see in Windows Task Manager that Evernote is constantly using my hard disk.
As soon as I close Evernote, my hard disk activity drops back to its normal level as before this update.
Have other people using Evernote 10.22.3 on Windows noticed this phenomenon ?