Works fine for me, no crashing, no slow down, can even alt tab. What os and specs you running just out of curiousity?
I use window XP SP3 ,( no tweaks legit copy), intel core duo 6600(45°c max onload) and radeon 4850(latest catalyst drivers, 35°c idle 45°c on load), 2 giga ram, several fans, fans in front the video cards, fans everywhere more and it fly up , the motherboard is a P5W DH deluxe with an onboard HD audio realtek, and a SB2 audigy in backup in case of sound problems. The disks are 2/3 empty , defragmented free of any known viruses or spywares,background processes are all shutdown including firewall, antivirus , and peerguardian.
Its a clean happy and i dare to say loved PC, i dont think it ever felt neglected so i cant explain the crashes, i daily remove the dust and clean the components inside with a soft pencil.
It dont crash during the match itself, but i had lockups just trying to launch the game yesterday,or exiting a match, not had the problem today so i guess it was activation checkserver problem. Another problem i get is after a rare ,once in blue moon,successfull online match i must re launch the game cause it dont find reactor anymore ...
Ps: all the required ports are forwarded