I use the latest nightly on my Macbook Pro (OS 10.12.3). 1. Go to event.elle.com.tw/2017/ellerun/ 2. Wait it to finish loading That tab is loading slowly. Firefox becomes very slow. Other tabs barely work. Chrome can play it well.
Hi Blake, I tested this issue on Mac OS X 10.12 on Macbook Pro with FF Nightly 54.0a1(2017-03-05) and I can't reproduce it. In my case, the tab is loading as fast as on Safari, I can open other tabs without making Firefox slowly. For testing this issue, I use a new profile without add-ons. Blake please see if this is reproducible in safe mode with the latest Nightly version. Thanks
It is weird that I can still see this problem with safe mode. Eric, Can you repro this problem?
Flags: needinfo?(bwu) → needinfo?(etsai)
We seem to be overpainting here. If I turn on paint flashing in devtools, the banner is painting pretty much every frame. This might be a graphics bug.
Yes, I'm able to reproduce this using Firefox 54 Nightly (2017-02-23 & 03-06) on Mac OS X 10.11. Performance record shows Gecko spends half and graphics spends the other half. After load done, it works good for me.
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