Honestly the official Netflix site seems to perform similarly to your implementation in terms of number of files it downloads and the size of files. One thing

Honestly the official Netflix site seems to perform similarly to your implementation in terms of number of files it downloads and the size of files. One thing I found was when emulating mobile screen size I wasn't able to horizontally scroll with my track pad. It works on Netflix though. I'm betting you'll find 100+ of those 'small' things with user testing across different OS/browser combinations.