Since currently Lemmy is mostly made up of nerds, I'd like to know what browsers you use and why? You could just upvote the comment with your browser of choice if you don't want to explain.
Take a look at vinegar / baking soda as an extension for safari. It replaces the non-standard video players on websites like YouTube with a plain HTML5 player. Much smoother and you get all the iOS / macOS features like scrubbing and PiP. Plus it blocks ads as well!