[Ataros]

Vsynk may be a problem. It cuts FPS from 60 to 30 to 15. Need to use a 3rd party utility to enable triple buffering if vsync is badly needed (drivers CP handles triple buffering in OGL only). In release version there was no true fullscreen and vsync could cause less problems.

Patches cause slow downs because:
- files get more and more fragmented when patching as HDD gets filled in month by month and internal Steam defrag is not good enough.
- new versions may not woork well with old conf.ini and other ini files. Need to delete Documents/1C-Softclub folder (backup control and info-window settings first)
- new patch files need to be cached by windows again and this takes time
- if you did not add both Steam and Documents/1C folders to 2-3 exclusion lists of your antivirus (real-time file monitor, network monitor, etc.) , it will scan new patch files when loading them
- new graphics drivers introduce new image enhancements (like new AA methods) which may be switched on by default in drivers.
- AA was improved in game a bit and may conflict with drivers AA settings if used (need to be set to application controlled).
- etc., etc. Please see a link #2 in my sig for more ideas of what can go wrong in a system.

Try running in pseudo mode, disable all background applications like TS overlay or Skype, upgrade motherboard drivers, check if PSU is clean and not getting overheated, check out if GPU fan is clean of dust, check if clocks and temps are the same as some months ago, etc.