Screen 5 - The Shortcut

There are two paths through this screen. Going to the top right is faster.

Balloon

There is a tight space to get a balloon jump and not bonk on the platform above. This is the fastest method as it does not have Rush's pause animation, but it can be tricky.

Rush Coil

This is slightly slower due to the Rush Coil animation in the menu. It is however easier to execute, since you can jump against the wall then fall straight down onto Rush.