&gt; HTML5 video was noticeably faster and higher quality on day 1 and Flash never caught up on performance..<p>Flash video was never perceptibly slower than html per se. The only thing that really affects video performance is whether or not it&#x27;s hardware accelerated, and in cases where flash used HW it performed the same as html. The reason it seemed slower is that AFAIK there&#x27;s never been an HTML video implementation that falls back to software, whereas flash would do so if HW wasn&#x27;t supported.