Well i've got a decent computer but the thing is after a while ( about 30 miniutes ) the game starts to stream slow, IE some of the the roads and buildings load slow as in they would take a few seconds to fully show up. This has happened to me on GTA SA but i found a stream fix for it, does anyone know if there is one for GTA IV ?.

What are your specs? What mods are you using?

I think that's because you're driving faster than the game is loading... so you go too fast and your computer can't load or something like that. It used to happen to me before i bought my new graphics card.

If your using ELS or alot of modded cars, its probably that.

Dem' polys.

I'm not too much into PC's so i can't remember my system specs but I have a GeForce 520 Graphics card, Duel Core 3Ghz CPU, 2GB RAM. I currently have two mods one for the FBI Buffalo and one for the LCPD crown vic. After playing around with the game it seems that driving just a tad slower does the trick.