Thanks to Joats for showing off this trick and explaining it!
What's going on:
I start off the run with a capped FPS of 60, this can be fine-tuned to gain the perfect height on the boost and save maybe a second.
This boost was discovered in Hitman 2, where if you subdue someone whilst in cover at a specific point in the turning-around animation, you will experience an upwards boost.
Then I uncap my FPS when I'm in the air to fall faster, as the speed at which you fall is dependent on your framerate.
Kill Franny, Kill Caruso
Then drop down onto an invisible ledge in the lab from where you can shoot the virus and exit.
This run is by no means perfect but I'm glad that I could show off the lab drop on HITMAN™ for a World Record speedrun.
