GTA IV Slow map rendering

[ravesaint5]

Yesterday, I started to insert modded cars into the game. This increased my 'vehicles.img' file from 83MB to 282 MB which causes the slow map rendering. I know this is the issue because I inserted the original file and my game ran flawlessly.

Can someone please give me a solution on how to fix this? (If any [Most likely is])

What I want to avoid: Deleting the car mods.

Thanks in Advance.

 

[Thornyjohny]

I had this problem without any mods, and for me overclocking my GPU helped a lot.

 

[ravesaint5]

I just tried that, unfortunately it didn't work.