I liked taking bottom path first in the opening for a few reasons. First it's a little harder so is nice to get out of the way first. There's also a bigger chance to bring a bunch of enemies down with you if you do top path first. It also makes the jump after first elevator a bit easier because there's less enemies.

I noticed after you might be able to drop elevator right before red key grab to save a couple seconds waiting for it.

The huge time-save in this map is a linedef skip I think in the middle of the blue door in the hallway before archvile room. This saves 30-40 seconds and stops doors from closing on you and releasing caco's. Couldn't find a consistent set-up but got it a decent % just by going fast.