Left 4 Dead Lags for 4-5secs in my New PC

CPU- athlon 64 x2 5000 2.6GHz
GPU- 9400GT 1gb
2gb memory
XP SP2

this is my system and whenever i play left 4 dead, it lags, like it freezes for 4-5 sec and an annoying cyclic sound can be heard (usually a sound from 1-2 frames from last play). this usually happens when i go to different location like new rooms or new streets. i tried changing the graphics settings and somehow, the lag lessens, but it is still there.

i can play Crysis in mainstream settings with x4 AA and vsync without lags in 10-12fps. Left 4 dead plays a higher FPS in full settings but the problem is that it lags.

I wonder if i buy another 2GB memory, would it get rid of the lag? or should i reinstall the game? i read the system requirements of the game and my system went pass through the required. please help, coz it's really annoying.

It HAS to be connection. I've ran L4D on my crappy Vista laptop quite nicely..from 18 to mid/high 20s fps Im sure, and I have a T7200 2.0 C2Duo and a GeForce Go 7300 "turbocache" crapgasm. With a good connection, you should be able to run anything with a Source engine from a computer that isnt older than 2-3 years.

hey guys, thanks for the reply.

btw, i'm experiencing lags in single player mode not with internet connection. although i also play through garena. I'll check the multicore rendering as j29ville said.

it is really strange coz i can play NFSU in great settings with the cars and environment set to medium to high with no lags. although it lessens the FPS but it has no single lag.

thanks .i hope muticore rendering will do the job.

Hey guys, that actually worked. i disabled the" multicore rendering" in the graphics options in my left 4 dead and there is no lag anymore. Left 4 dead said in the captions that we should enable the multicore rendering whenever we are using a multicore processor (i.e. dual core, core 2 duo) and i'm actually using a dual core and enabling it causes some lags.

i don't know why but disabling it surely solve the problem. thanks so much.