I am on Shadowlands and am having major lag issues as described above. I haven't even attempted to get on a raid because I just KNOW! it will be impossible to play correctly. Just doing dailies is enough of a chore and now takes twice as long to complete with all the lag and the wonderful frozen screen.....
It's almost unplayable. Maybe its time to give this game a break... (Hint Hint) FIX IT SOON!