Speedrunning is amazing and I am in awe of the talent and care it takes to do it well. The fastest way through most games is to glitch it and go out of bounds to bypass massive areas to save time. YouTube BitRain makes a great video explaining how you can glitch through the walls in Half-Life 2 which is the basis for his 40:49 speedrun featured below.
https://www.youtube.com/watch?v=LnFjTG9J-T8
https://www.youtube.com/watch?v=LnFjTG9J-T8
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I've seen some of these explanations in the past. It's magic as far as I'm concerned.