Yes, it is. No, the delays on Youtube don't come from the performance of the adblocking code, so you won't notice many differences. But more efficient adblocking is good for everyone - noticeably more so on devices with batteries, but still helpful for everyone.

I use brave as my YouTube browser and it does seem to perform better than Firefox with unlock. There's frequently weird delays with Firefox where the ads get through a little and are then blocked(admittedly I probably only update it like once a month). I don't get that with Brave.