Speedjumps are like trickjump maps, without the tricks. You do not need adrenaline needles to win the map, you do not need to know how to gamma, zeta, whatever-jump your way through a boring landscape of blocks.
The most advanced jump you'll need to know, is a crouch-jump, and even that will only be used a couple of times.
The important thing is speed, and timing. The goal is to get to the top of the tower, and use the portal.