System Shock 2 /Speedrun/Big Jim/0:12:40

[6745de8e0419eunn_atropos]

Big Jim, Any% 0:12:40 
https://www.youtube.com/watch?v=iRC4ulWn-ZE

[6745de8e042dcDjant]

Was switching to Easy difficulty midway allowed under speedrun rules? I know it doesn't provide much of an advantage besides more psi points and cheaper abilities, considering how he used the invincibility exploit, but I would like to know about the rules of the speedrun still.

[6745de8e044b0unn_atropos]

There are no a lot of people that are doing speedruns, and those who do are using it. So I guess it's in the rules.
The process is explained in Big Jim's second tutorial  at 08:13.
To paraphrase:  Impossible allows you to die really quick (you need that for the death glitch), but then you can't affort psi skills because of the high prices. Switching to easy won't change anything in the gameplay because you are immortal at this point anyway.