This is a speedrun of Halo 3 ODST in 1:34:19 timed with the timing method known as RTA, or real time attack. There is also a timing known as theater timing, in which this run clocks in at 1:26:23. There are 2 categories, new game and new game+, new game starts on a fresh profile or temporary account and starts on mombasa streets, whereas new game+ starts on accounts with audio logs and weapon caches unlocked so that you can do the levels in any order you choose and can have the mongooses from the caches already unlocked.

Major time savers: Oni alpha site, kizingo blvd, kikowani stn, and nmpd hq although I can save time pretty much everywhere.
But enough with the explanations, heres the run: http://www.twitch.tv/chappified/c/3719840