FWIW, reverting the fix for bug 1283302 (fixed in FF53) fixes this issue. Before that fix, we would wait up to 250ms before painting, now we wait for 5ms. You may be running into the intersection of that change, plus several performance fixes that make us paint much faster in FF57. When we fixed 1283302, it was after a lengthy user study that indicated a higher perceived performance score when we paint sooner. We knew that FOUC (flash of unstyled content) could happen more often, but perhaps it's happening more often now that we paint faster.
--Jet [1] https://bugzilla.mozilla.org/show_bug.cgi?id=1283302 On Thu, Aug 31, 2017 at 10:24 AM, Gervase Markham <g...@mozilla.org> wrote: > On 18/08/17 12:11, Gervase Markham wrote: > <nothing> > > Whereas what I meant to say was: > > Have we changed the timeout recently regarding how long Firefox waits > for a stylesheet before rendering the page? In the past few weeks I've > seen many more instances of a page loading unstyled, then re-laying out > a second later with style. It happens for me quite a bit on xkcd.com, > but there are other pages too. > > I think we may have set the timeout a bit low, because the result is ugly. > > I'm using Nightly 57.0a1 (2017-08-30) (64-bit) on Ubuntu 16.04 LTS. > > Gerv > _______________________________________________ > dev-platform mailing list > dev-platform@lists.mozilla.org > https://lists.mozilla.org/listinfo/dev-platform > _______________________________________________ dev-platform mailing list dev-platform@lists.mozilla.org https://lists.mozilla.org/listinfo/dev-platform
