39647 2010-05-24 23:19:01 -0700 Big rendering performance issue with multiple font-faces which cause recalculating styles 2010-08-26 12:34:35 -0700 1 1 1 Unclassified WebKit Layout and Rendering 528+ (Nightly build) All All RESOLVED FIXED P2 Normal --- 1 mikelikespie hyatt ap hyatt jim mitz oldest_to_newest 230103 0 56974 mikelikespie 2010-05-24 23:19:01 -0700 Created attachment 56974 Testcase with slow behaviour simulated with javascript At Scribd we've been @font-face excessively. Unfortunately, getting multiple fonts to load quickly has proven to be quite the challenge. I've narrowed it down to to the fact that after each font-face loads, the style gets recalculated. This even happens if you have several uri-encoded fonts in one CSS file. The only way I've been able to get around this (sometimes) is displaying an element with a given font-face, setting its display to none after a little bit, and then loading the CSS in. This makes it (sometimes) load the font when the CSS is loaded without it having to recalculate the style. This performance issue is most apparent when looking at the Timeline view in developer tools and is most noticeable using chrome (it recalculates the layout a bit slower than Safari it seems). The time to recalculate the style is much more significant on Scribds' website because there's toolbars, ads, and whatnot which give it more load I imagine. I attached two files. slowfont.html which is a repro of the performance issue. fastfont.html is an example of the workaround (which works in chrome at least). You'll notice in fastfont there are not N "Recalculate Style" events and it performs faster (even though it has 1.5 seconds worth of timeouts). I haven't been able to figure out a reliable way to "prime" webkit to *quickly* load a font without it causing the layout to recalculate. 230104 1 56975 mikelikespie 2010-05-24 23:20:19 -0700 Created attachment 56975 Example of unreliable workaround to get styles to not recalculate several times. 230493 2 mitz 2010-05-25 15:13:19 -0700 See also bug 36303. 230496 3 mikelikespie 2010-05-25 15:16:37 -0700 Changing platform to all. (confirmed this happens in windows as well with at least with chrome). 230498 4 mikelikespie 2010-05-25 15:17:31 -0700 (In reply to comment #2) > See also bug 36303. We came across this as well. This is why in the example I'm just setting the innerHTML to a big block of CSS. 270029 5 65598 hyatt 2010-08-26 12:30:38 -0700 Created attachment 65598 Patch 270031 6 hyatt 2010-08-26 12:32:51 -0700 The attached patch will at least improve things when multiple fonts load synchronously at the same time. However it doesn't address the more general concern that the entire document recalcs style when a font loads. That's a pretty difficult problem to address without consuming a lot of memory (to point from the font back to the specific renderers that use it). 270033 7 hyatt 2010-08-26 12:34:35 -0700 Fixed in r66122. Please open a new bug if your particular use case is still slow. 56974 2010-05-24 23:19:01 -0700 2010-05-24 23:19:01 -0700 Testcase with slow behaviour simulated with javascript slowfont.html text/html 5012 mikelikespie PCFET0NUWVBFIGh0bWwgUFVCTElDICItLy9XM0MvL0RURCBYSFRNTCAxLjAgVHJhbnNpdGlvbmFs Ly9FTiIgImh0dHA6Ly93d3cudzMub3JnL1RSL3hodG1sMS9EVEQveGh0bWwxLXRyYW5zaXRpb25h bC5kdGQiPgo8aHRtbCB4bWw6bGFuZz0nZW4nICB4bWxucz0naHR0cDovL3d3dy53My5vcmcvMTk5 OS94aHRtbCc+CiAgPGhlYWQ+CiAgICA8bWV0YSAgY29udGVudD0ndGV4dC9odG1sOyBjaGFyc2V0 PXV0Zi04JyBodHRwLWVxdWl2PSdDb250ZW50LVR5cGUnIC8+IAogICAgPHN0eWxlIHR5cGU9J3Rl eHQvY3NzJyBpZD0nZm9udF9zdHlsZXMnPgogICAgPC9zdHlsZT4KICAgIDxzY3JpcHQgdHlwZT0n dGV4dC9qYXZhc2NyaXB0Jz4KICAgICAgdmFyIE5VTV9GQU1JTElFUyA9IDUwMDsKCiAgICAgIHZh ciBkYXRhVXJpID0gIjtiYXNlNjQsQUFFQUFBQU1BSUFBQXdCQVQxTXZNbGV0YTVRQUFBRE1BQUFB WUdOdFlYRHpVUW5oQUFBQkxBQUFBSVpuWVhOd0FBQUFFQUFBQWJRQUFBQUlaMng1Wm51Myt2OEFB QUc4QUFBR3ZHaGxZV1JtMlVNekFBQUllQUFBQURab2FHVmhCbUVITHdBQUNMQUFBQUFrYUcxMGVD 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56975 2010-05-24 23:20:19 -0700 2010-05-24 23:20:19 -0700 Example of unreliable workaround to get styles to not recalculate several times. fastfont.html text/html 5202 mikelikespie PCFET0NUWVBFIGh0bWwgUFVCTElDICItLy9XM0MvL0RURCBYSFRNTCAxLjAgVHJhbnNpdGlvbmFs Ly9FTiIgImh0dHA6Ly93d3cudzMub3JnL1RSL3hodG1sMS9EVEQveGh0bWwxLXRyYW5zaXRpb25h bC5kdGQiPgo8aHRtbCB4bWw6bGFuZz0nZW4nICB4bWxucz0naHR0cDovL3d3dy53My5vcmcvMTk5 OS94aHRtbCc+CiAgPGhlYWQ+CiAgICA8bWV0YSAgY29udGVudD0ndGV4dC9odG1sOyBjaGFyc2V0 PXV0Zi04JyBodHRwLWVxdWl2PSdDb250ZW50LVR5cGUnIC8+IAogICAgPHN0eWxlIHR5cGU9J3Rl eHQvY3NzJyBpZD0nZm9udF9zdHlsZXMnPgogICAgPC9zdHlsZT4KICAgIDxzY3JpcHQgdHlwZT0n dGV4dC9qYXZhc2NyaXB0Jz4KICAgICAgdmFyIE5VTV9GQU1JTElFUyA9IDUwMDsKCiAgICAgIHZh ciBkYXRhVXJpID0gIjtiYXNlNjQsQUFFQUFBQU1BSUFBQXdCQVQxTXZNbGV0YTVRQUFBRE1BQUFB WUdOdFlYRHpVUW5oQUFBQkxBQUFBSVpuWVhOd0FBQUFFQUFBQWJRQUFBQUlaMng1Wm51Myt2OEFB QUc4QUFBR3ZHaGxZV1JtMlVNekFBQUllQUFBQURab2FHVmhCbUVITHdBQUNMQUFBQUFrYUcxMGVD 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