Got a couple time saves from Alexo's full game run in the opening. One is strafing onto the elevator after hitting second switch and the other was taking the pillars back after yellow keygrab. I missed the pillars but am pretty sure it saves a couple seconds if you get it.

Decent time save in the switch puzzle area by going to secret area and making a precise jump. This saves having to hit like 3 more switches and waiting for elevators.

Really bad ending for me. Forgot to grab shotgun ammo in the opening so ran out.