Looking at the level map Spikestuff linked to on the other userfile, I thought of another route that could be potentially faster, and it was.
Basically, instead of descending to the first gem on the previous route, you go right and jump down to a lower track, then jump to the second gem.
Main timesave here is the fact that you pick up the trail segment along the way, speeding up the section after the gem warp.
Still some frames to save, but its getting more optimal, this is probably the fastest route, unless there's some faster way of reaching the gem, maybe somehow clipping through the tracks.