I got bored and wanted to play the game again but no one plays online it seems, so I started to run the singleplayer episode Lost for fun. After 15 or so runs I got the time down to 472 seconds. The only other time I could find online was 566 seconds by Akari in 2016:
The level was completed as designed, no special tricks, scripts or glitches were used. One trick that could save at least 30 seconds is the elevator warp (falling through an elevator) but I don't know how to do it consistently. Thinking reducing the framerate might help. The whole level seems fairly robust, and I don't know what other shortcuts may be possible.
If anyone else out there is running this level and has a better record, drop a screenshot here, would be interested to know what optimizations are available.
Cheers,