i have a fps drops problem in smokes and when i see a players next to me and sometimes when i shoot.
I dont know why but it drops from 99 to 60-70 even 50 and then it up again fast to 99.
Intel(R) Pentium(R) 4 CPU 3.06GHz 3.07 GHz 2Gb RAM ATI RADEON 9800
Check Task Manager when this happens and see what process take over the CPU. Also if you are using XP and it has been installed since a long time it may be the OS itself that is the problem as it is known to reduce its performance with time.