I have performace-problems with HALO on my dual 1,2 GHZ G4, with ATI Radeon 9000 and 512MB RAM. It lags, lags, lags and lags some more. All other gamers I run in 1600*1200 with all graphics on max (RtCW, Alien Vs Predator II, Ghost Recon, Americas Army etc) and it never lags, but HALO just sucks...