(I mean: First game I play when I just startet C2 fps is normal, second game is worse)
I tried several things to solve this, also defrag etc. did not help, Gamebooster did not help. Could nothing find at the forums. But.
I discover following. When the new multiplayergame starts and it show very low FPS (10) I switch back to desktop (Alt-Tab) and the switch back to the game: stuttering is gone and fps normal. This cost me 10 seconds.
Of coarse this is a bug which has to be solved. Since patch 1.9 many dx9 players complain about performance. (It looks like the lag which we saw at Black Ops when it came out.)
Oh yeah: My specs:
Vista 32bit 4Gb, STEAM version
Quad 6600, 2400MhZ
9800 GTX+