ThisAMJ

Times are in seconds, starting from the speedrun timer start point (currently teleport_start.Enable())

Playthrough 1

0.000 playmovie_connect_intro.__MovieFinished()
0.000 teleport_start.Enable()
0.000 teleport_start.Enable()
0.500 clientcommand_lightinghack.Command(r_flashlightbrightness .25)
0.533 clientcommand_lightinghack.Command(r_flashlightbrightness .25)
0.817 counter_start_glados_coop.Add(1)

ThisAMJ

Imagine a bus.
These cues are for when to press a movement key directly into the elevator while standing at the edge.
For normal elevators, the edge is where you can look down and see the elevator shaft.
For Old Aperture elevators, the edge is right in the middle of the fizzler on the elevator.

A number of the fades may be impossible because of how long the elevator takes to arrive,
or perfect movement may not be enough to enter the elevator in time.

Don't stress exact timing too much (unless you're going for wr *wink*), and prefer going after the cue than before.