On this island three things are important: Route, Maintaining Speed, and Placement Glitch.

The first thing you want to do is stay in an accelerated state, but to do that you need to accelerate. To do this have your mouse as far to any direction you want to go as you can manage. To maintain this, you must either roll or be moving straight after you jump or fall. doing this saves a lot of time over the run.

(Every carat indicates the course definitely has Placement Glitch) The route is France^, Colonial America, Leo, Timbuktu^, back to Colonial America, Lewis & Clark^, China^, Viking^, Greece^, Thomas Edison^, Aztec^, Mount Everest^, back to France^, then to the lab^ and the future^.

Placement Glitch works by moving the character while the screen is loading. While clicking very rapidly after clicking on the compass to enter a course is more consistent, it takes longer to load you in and your time savings are minimized, it is about .5-1 second each time you do it..

Additionally fast travel is still the fastest way to go for most areas, and on the first part of Everest flying to the top is faster than traveling up the path, I think flying is faster for Leo too, but I don't know if it's possible there.