4 ms·

I notice when I leave a 2+ hour YouTube video playing in the background, Safari can play 10 of those in a row and still keep usage to 2-3% of CPU. With Firefox

I notice when I leave a 2+ hour YouTube video playing in the background, Safari can play 10 of those in a row and still keep usage to 2-3% of CPU. With Firefox something just happens after some time and it starts to 100% one of CPU cores. Not sure if this is something YouTube does or it's a general video playback problem.

acqq 9y ago
You "discovered" a problem in Firefox when displaying Youtube or Facebook pages with more than one video, the problem which I mentioned more times on this site. I observed it before FF 57 was released, on different Windows computers but especially catastrophic on the less powerful ones ( https://news.ycombinator.com/item?id=15688195 https://news.ycombinator.com/item?id=15688195 or https://news.ycombinator.com/item?id=15687830 https://news.ycombinator.com/item?id=15687830, I've mentioned that I also discovered that there are complaints at least since February this year, https://www.reddit.com/r/firefox/comments/5sikxt/firefox_unbearably_slow_on_facebook_and_youtube/ https://www.reddit.com/r/firefox/comments/5sikxt/firefox_unb... only to be downvoted heavily, however let's ignore that at the moment) but now on FF 57 it is provably the same. Just produce a page with more videos autostarting and marvel how much (unbelievably lot!) CPU Firefox uses. 8 videos playing on the page are enough to demonstrate it. Fascinatingly, even if they play somewhere on the page outside of the part which is currently displayed, and even if they are not producing any sound (marked as such) they are going to eat immense amount of CPU.