Kind of a vague title but basically this discussion is all about posting what time you got on some of the levels, use a stopwatch or something like that.
My Times (perhaps the baseline I guess):
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Level 00: 1 minute 31 seconds (UPDATE: 32 seconds)
Level 01: 33 seconds
Level 02: 51 seconds
Level 03: 49 seconds
Level 04: 2 minutes 16 seconds
(UPDATE: 1 minute 24 seconds, did a heavy skip by spamming wallclimb on the walls at a 90 degree angle to the left of the starting point)

(PS, this wasn't done using Beatrun or Wheatleys Parkour, this was done with Improved Advanced Combat Roll, High Jump [Restored], Double Jump (by Jordan Venti), Quick Slide, Disabled Jump Boost/Acceleration for Sandbox, [VManip] Vaulting, and Mantle + Wallrun w/ VWallrun Fix.)