I have had an issue with CX since 14.0 release and I was so much hoping that 15.0 would be the big salvation, but it's not really been much of an improvement.
As I don't use a supported distribution, I don't get much of official support and I'm quite unhappy with playing the only game I play, Guild Wars 2 (unless I use wine with staging features enabled). I have two machines, one slightly more powerful than the other
CPU: AMD Athlon II X4 651 Quad-Core
GFX: Nvidia GT640 2GB (1920x1080)
CPU: AMD FX-6300 Six-Core
GFX: Nvidia GTX 660 2GB (1920x1200)
I do run 4.1.13 kernel based on ArchLinux (minus some intel configuration) and nVidia driver 355.11. Here is estimated average fps I get in the game (Lions Arch, just standing still):
Machine A Machine B
CX13.2 14 27
CX14.X 7 12
CX15.0 6 17
WINE 24 48
The values gets worse the more movement there is and I'm already running on the lowest settings in GW2.
I have disabled vsync, as I have earlier noticed it really kills of fps, I have set high performance and ignored image quality, so I really don't know what else to do, running htop on the machine while playing shows that there is still some unused CPU power left. The game is slower when downloading updates (I blame that to the huge data file they use to store files).
Anyone have ideas of kernel options, nvidia settings that may make things slower? Is there some secret settings in CX which I'm the only one not knowing?