I am trying to speedrun this game and i found out two really interesting solutions/ tricks that could potentially save a good amount of time. One of them is way easier and more effective than the other but it feels like both are really interesting in their own manner.

Easy one - Chapter 6 - Conversion Gel Climb - "1 Building Solution" - In this solution the test subject doesn't have to get on the second building and thus saves a lot of time compared to the alternatives. Two points to mention. To get up on the first roof use two VERTICAL portals for an easy angle. Also when on top of the roof you have to place the roof portal as shown in the video otherwise you might not have enough airtime to reach the platform easily. Video below.

Hard one - Chapter 6 - Vacuum Tube Examination (part2) - "Midair Gambit" - In this solution the test subject has to implement acrobatics and precision in order to skip using the faith plate to get launched inside the tube room. This is a hard trickshot and personally i am not consistent in pulling it off. Made a single level video though to share it here and see what other players think about it. If done properly it finishes the mission in a heartbeat. On the flip side, just 2-3 failed attempts could easily result in a time loss instead. Video below (trickshot shown around ~0:57).