We recently found out that we can Pre-Cut some doors in M15, M16 (the observation one) and in M17 (the first door + the terminal + the terminal code door) We added for it as a sub category called Pre-Cut that means you can Pre-Cut the doors in an earlier mission (I will uploaded the Pre Cut saves not that everybody has to recreate the pre cutted saves) Time calculation for Pre-Cutting:

M15: 0:15 M16: 0:15 M17: 1:15 =1:45

That is all time you can save with Pre Cutting (M15 is normally done during M12 since it is just 1 second time loss but the other Pre-Cuts just make you loosing a lot of time)

Note for the Vanilla runners: This is only for Kitty: Isolation the Vanilla Moderators decided against allowing this and the M17 thing is not possible since the door where in M4 the humans are running through that closes behind them is opened by default