C'mon Man! why do you need HOT COFFEE Mod???
anyways you can download these kinda stuff here
http://thegtaplace.com/pafiledb.php?...category&id=19 . go under the "Mission Script" & you'll find it.
Its not
unusual, that the game runs slow in that mission, its because your Onboard Gfx. cannot run (process) that stage quickly enough. the reason is the smoke & fire are GFX Intense & need more processor power.
I also have the same config.
If you wanna play the game without lag , then set the resolution to 640x400x16 for that kinda missions (e.g. all flight & car/bike chase missions) & when you are just roaming then you can set the resolution to "32 bit" & "FX Effects" to High.