How come brave is so fast?

I am using Brave for a long time now and recently came across a bug (unrelated) for that I had to Firefox.

Out of curiosity, I had loaded a Youtube video in Brave and Firefox (with adblocker plus), it took 25 secs in Firefox, and 2 secs in Brave to play first second of video.

This is mind blowing, I wonder what Brave is doing that exclusively that other browsers aren’t.

Fyi, I had same results (like Firefox) on Chromium. Now this is really impressive as Brave is a Chromium-based, so you must be doing something cool that Chromium is not doing.