I think the performance tanks due to how BioWare coded the camera panning with the mouse. Like I said in an earlier post, if you enable raw mouse input through the "ProfileOptions_profile" file, you lose the ability to pan the camera using the right mouse button, but you also get rid of the frame drops associated with it and you can move the mouse around the screen like crazy with no more issues. Hopefully this can be patched later on, but I'm going to move to Windows 8.1 myself in the coming weeks, since that should by all accounts make the game run a lot better!
Ahh, good to know. I was aware of the raw input not working for most actions in game, but not it's effect on the weird performance hit. Let's hope that gets fixed eventually.
I'm not sure if it has been mentioned, but for people with AMD cards running with Mantle, Windows 8.1 probably won't make much of a difference vs 7. The largest improvement between 7 and 8.1 comes from a few DirectX features only 8.1 has access to. I can't verify it personally, but Mantle will probably perform about the same on both platforms.





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