How to go about very fast and long ornaments?

[thesuperguy]

In many of the more difficult pieces, it is not uncommon to see just whole entire bars filled with 50 or so notes just because, why not.

What I want to know is how to go about practicing these very very fast ornaments. I already know the "start slow get faster" mentality and that's what I would normally apply to my practice, but I just want to know if there are other techniques so that my fingers don't drag across the keys but rather glide.