Alright, maybe I'll give it shot on Edge later then, to see if it runs better there, thanks.
I have considered switching to Edge since it's supposed to be much better on battery life too - but since I use a Macbook, a Linux desktop, a Windows laptop and an Android phone and like to have bookmark/history/etc sharing, Edge has been a tough sell. Somebody really needs to standardize some browser profile protocol that you can sync to arbitrary cloud storage.