[odshoifsdhfs]

One thing that came to mind, which may be relevant to you or not, do you have the Whatsapp desktop client installed/running? A few months ago, an update seems to have screwed up something that made my Mac much slower and unresponsive when it was open (my gf and my ex had the same issues with WA, the moment they closed WA it was snappy again).

[alxlu]

I do have it installed, but it usually isn't running. I'll uninstall it and see if that helps though. Thanks!