Hey Sam, its appreciated for the time it took uploading and editing a video. Unlike YT, feel forgiven here. Realistically, a heavy truck does not accelerate that fast as a sports car, especially when it comes to tight turns and frequent elevation changes, where as a sports car could realistically drift around those corners, but not in SC4, you just can't drift over 200 mph, not to mention, anytime you go off pavement your slown down, or stopped because you can't drive into tiles, oh well.
Anyway, I use FRAPs and have even encountered lag, but you have to calculate the amount of memory the video takes, versus quality, video format/transfer/uploading speed, when it comes to 3D games, this can take up more. However, Fraps seems to be the best at capture SC4, its not 100 percent free though. CamStudio on the other hand records games like SC4 for free, less memory space then Fraps, but I have not gotten it to record sound for any game. I just had to make it seem that way by editing existing noise.