When maximum speed and glide is essential, go straight to the top and hot wax with Burton Fluorocomp Hot All Temp Wax. Scrape well and brush the dickens out of it, and you'll be blowing by the rest of the world on the cat track.
14˚F to 32˚F (-10˚C to 0˚C)
All-purpose wax for most days
Competition grade wax with extra fluoro for the best glide
Apply with iron set to medium heat, scrape, brush (optional) and go.