Have you tried fake fullscreen mode? Also if you can update please to 10.9.4 as it does improve video performance a bit.
P.S. You might be a victim of save file performance deterioration. If you're have any experience with developer tools I can tell you what simple instruments might help you diagnose the issue. If not then you have to wait a bit until we resolve all the crashing issues and can start thinking on 6xx series performance (which indeed looks to be a bit low)
P.P.S If you can locate the "worst" lagging place and send save/screenshot to platon.fomichev@larian.com it might help as well.
Last edited by Stauff1138; 08/07/14 09:20 AM.
