Hello,
Im suprised to see that this thread is like 10 months long and still going..
I had same issue with FPS and it all started after upgrading my account with HoT expansion. Both on my gaming PC and laptop. On pc i had like 130 fps and now its 17 max regardless of graphic settings and the same thing happened on laptop and now its unplayable. Believe or not, but changing graphics settings and and restoring them to default combined with restarting the game helped on gaming pc. Laptop seems to get worse day by day.. any suggestions? And what’s support opinion on this?