Luke

Relax. I have gone from a 6 to a 10 Pro myself. For the most part performance is significantly better. Yes, I've noticed the issues you've mentioned in YouTube occasionally but come on. This is clearly just an optimisation thing/a bug thing and will probably be resolved in the next week or so.

Edit: in fact jumping into YouTube now and it seems like the issue is already fixed. Scrubbing and jumping around YouTube videos is now instant and smooth everywhere.