Doomed Speed Demos Archive
http://www.doomworld.com/sda/doom_sda.htm

Pwad:      Hell Revealed
Pwad name: hr.wad
Maps:      02
Skill:     4
Category:  Speed
Exe:       Doom2.exe

Time:      1:44

Author:    Opulent
Email:     opulent@goodnet.com
HP:	   http://www.goodnet.com/~opulent/doom2.htm

Comments:  

You don't need the blue key at all.
shortcut is to switch the switch before raising it...
but it really doesn't save much time.

too many demons to let you really be fast.
nearly a maxdemo... 
wind up killing 90+% of the monsters you meet.