It would be useful to include charts to compare speed over time among players. This would be a great tool to see where players are gaining their speed or where mistakes are being made.
Here's a quick example of one type of comparison:
http://i.imgur.com/63CKu08.png
The x-axis could be time, or it could be distance with vertically-aligned checkpoint markers.
There is a lot of potential for other neat stats and visualizations, and I hope at least some similar things make it in.