FPS problems after forced to upgrade for the new client

hello, i have this problem that myh girlfriends computer startet have really low FPS (something like 20-30) and that ofcource gives hard lag so you cant really play the game, have anyone els tryed this? or does anyoine have a possible sulution for this problem. the computer have amd radeon r4 graphics i feel i tryed anything.. the game grapichs is at the lowest og cleaned up the computer, no virus no nothing. 1. i hope there is some genius who will help me out here. ~~~~sorry for my bad english ~~~~
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