Today I tried opening or making any change in a document in my Vault. It is extremely slow - takes about a minute for any change to be applied. While it is ‘frozen’ I see a ‘Obsidian Helper’ taking 100% CPU.
When I opened up the developer console I noticed that one websocket is in ‘pending’ mode (maybe this is normal?) At any rate it got me thinking to pause the Sync feature. Once I did that, everything works snappy and quick again.