The game doesn't need to load all of it's audio assets immediately

[TerryCavanagh]

This is a more complex, long term goal, but it'd be pretty nice if the web version of the game didn't have to load the entire soundtrack before starting.

For the main menu, you should only need to load Presenting VVVVVV (data/music/6presentingvvvvvv.ogg), and the sound effects. You could then have "loading states" before starting each custom level - i.e. you could scan a custom level and see which songs it's going to use, and then load those before starting the actual level. Many custom levels only actually use one song, so for a lot of cases, this would be a significant speed up.

(this is admittedly quite a lot of work)