(Note : this apply to 0.9.2 or below. For 0.9.3, it is highly recommended you instead use the timer mod available in the resources, to have the loading times not counted.)

The loading time of tracks is an issue for full-game runs. Say your computer needs 2 seconds per track. Over a full run, that's 42 seconds lost (there are 21 tracks in STK 0.9.3).

You can slash this time down significantly by preloading all the tracks into RAM by using another profile which has all the tracks unlocked. You need to enter each track once for this. You also need enough RAM so that your computer will keep it as a cache (4GB or more should be fine). Then, they will load significantly faster.