my current speed run is just over 2 and a half hours, it could be improved as i made the following mistakes..
1. not looking for bear traps, they actually slow you down alot.
2. wasting time on some bosses, when i could have got the easy kill with rocket launcher.
3. at a couple of stages i actually stopped to kill, instead of running on.
i shall get some footage of my ultimate speed run, that will be when i make it in 2 hours, just under or over