Basically, when hopping on flat surfaces, alternating between crouching and uncrouching for every hop gives player 0 friction.

CTG is a well-known movement technique in Portal 2 community, and since TBG shares a similar engine with Portal 2, this glitch also applies here.

More information about this technique can be found in Portal 2's bunnyhopping tutorial.

I briefly ran Portal 2 at the end of 2023 so I'm aware of this. For TBG specifically I noticed that holding crouch made it more consistent, but that was a long time ago so I may have to retest alternating crouch/uncrouch again.

CTG is useful especially on flat surface and straight line. In other cases, crouching all the time does indeed feels better.

On flat surfaces and straight line, the benefit of 0 friction quickly adds up, even though it is surly lot harder than holding crouch. It can be used in the end of Note, some straight sections of Epilogue, and many other cases.

Since you already have P2 speedrun knowledge: the SAR plugin is available in TBG now :), you can load the sar.dll and have check the groundframe in game. CTG does indeed provide 0 groundframe.

(I disabled those SAR huds when doing my attempts, just for fair play.)

I was practising just now and I think the reason why I probably believed it was more consistent to just hold crouch was simply because when I tried it those years ago was because I couldn't do it properly. That holds true now, I find it very difficult to strafe/hop properly while also alternating crouch, especially because surfaces in this game are usually not flat for long periods. There's a lot of moments where there's stairs, slopes and there's a lot of sharp turns in the run. That being said, I will keep practising. I'll look into using SAR for this game, I've been meaning to for some time anyway.

And again, congratulations on the insane Epilogue record, I had a feeling you'd grab it again. Haha. I'm sure it will stand for a long time.

A proof that CTG works: it can save ~2 sec in the end of Epilogue, compared to holding crouch.

..and I'm not a good bhop player in P2 community, at all.

If you're interested in using SAR, I've made some wrapper config files that make it work better with this game. SAR can provide quality-of-life features like:

• tick perfect in game timing,
• automatic start/stop,
• quick reset bind that resets both map and timer;
• sub-level split (also known as 'mtriggers', like the one i used in Tower) that let runner have better knowledge of their progress;
• in game hud, timer, and input display

If you're interested in this, I'm willing to better polish my script and make a guide or something. Have fun running this beautiful game :)

Yah like I said, I'm just bad at it. No doubts here that it's faster. Just something I need to practise. ^^