34649 2010-02-05 07:06:16 -0800 Extremely slow DOM access compared to other non-webkit browsers 2015-03-24 09:50:40 -0700 1 1 1 Unclassified WebKit Tables 528+ (Nightly build) PC Windows XP RESOLVED WORKSFORME http://blog.jeneric.net/2010/02/05/ie8-beats-chrome-safari-in-performance-tests/ P2 Normal --- 0 realgrandrew webkit-unassigned ap chad simon.fraser oldest_to_newest 188181 0 48232 realgrandrew 2010-02-05 07:06:16 -0800 Created attachment 48232 Blog post with regression source and more info access speed regresses over the size of the DOM table tree, It is down to 20x or more times slower than in every other modern browser, including Internet Explorer. It makes some DOM tricks unusable in WebKit completely 188182 1 48233 realgrandrew 2010-02-05 07:07:14 -0800 Created attachment 48233 test case the test case html 188296 2 mrowe 2010-02-05 14:10:08 -0800 I don’t think this is a DOM issue as much as a repainting issue. Profiling shows a large amount of time is spent repainting tables. QuartzDebug doesn’t appear to show any unnecessary repainting though. 450828 3 chad 2011-08-13 02:37:50 -0700 I'm seeing the same problem. I've made some examples. These examples are the same content with different styling: 1) Normal scrolling. Solid borders and border-collapse:separate http://chadvonnau.com/projects/web/examples/webkit-table-bug/index.html 2) Slow scrolling. Solid borders and border-collapse:collapse http://chadvonnau.com/projects/web/examples/webkit-table-bug/bordercollapse.html 3) Very slow scrolling and beach ball of death. Semi-transparent RGBA borders and border-collapse:separate http://chadvonnau.com/projects/web/examples/webkit-table-bug/rgbaborders.html I'm testing with Safari 5.1 and OS X 10.6.8 (+update) on my Late 2006 MacBook Pro. Firefox 4 sees roughly equal performance on on all of those examples. Safari 5.0 and earlier sees about the same performance on each example. Chrome 13.0.7 has similar performance issues with these examples. Here is another page that exhibits performance problems because of border-collapse:collapse http://panlex.org/u This is the same bug on Google's bug tracker: http://code.google.com/p/chromium/issues/detail?id=34736 450830 4 chad 2011-08-13 02:40:34 -0700 *** Bug 66184 has been marked as a duplicate of this bug. *** 450838 5 simon.fraser 2011-08-13 07:55:36 -0700 This bug is about DOM access performance, not scrolling performance. Please file another bug on the latter. 1079575 6 chad 2015-03-24 00:56:22 -0700 I just revisited this today and both Andrew's original DOM access issue, and my scrolling issue (Comment #3) appear to be resolved in Safari 8. On my machine, I'm getting over 60FPS on Andrew's demo, and the scrolling examples I linked are as smooth as can be. I put Andrew's demo on Codepen for ease of testing: http://codepen.io/cvn/full/vEbKJz/ I think this can be closed. 1079629 7 ap 2015-03-24 09:50:40 -0700 Thank you, looks good to me in Safari 7.1.4 too. 48232 2010-02-05 07:06:16 -0800 2010-02-05 07:06:16 -0800 Blog post with regression source and more info url.txt text/plain 80 realgrandrew aHR0cDovL2Jsb2cuamVuZXJpYy5uZXQvMjAxMC8wMi8wNS9pZTgtYmVhdHMtY2hyb21lLXNhZmFy aS1pbi1wZXJmb3JtYW5jZS10ZXN0cy8= 48233 2010-02-05 07:07:14 -0800 2010-02-05 07:07:14 -0800 test case ddp.html text/html 3988 realgrandrew PGh0bWw+DQo8Ym9keT4NCjxkaXYgaWQ9InlvIj48L2Rpdj4NCjxzY3JpcHQ+DQoNCi8vIEREUA0K DQovKg0KDQpERFA6IERpcmVjdCBET00gUGl4ZWxlciBicm93c2VyIHBlcmZvcm1hbmNlIHRlc3QN CihDKSAyMDEwIEFuZHJldyBHcnlhem5vdiAocmVhbGdyYW5kcmV3QGdtYWlsLmNvbSkNCkNvZGUg bGljZW5zZTogR1BMIHYuIDMgb3IgaGlnaGVyLg0KDQpUT0RPOg0KLSB3cml0ZSBET00gcGVyZm9y bWFuY2UgcmVncmVzc2lvbiB0ZXN0IGJhc2VkIG9uIGRyYXcgYnVmZmVyIGRpbWVuc2lvbnMgZ3Jv d3RoDQoqLw0KDQppc0lFOCA9IChuYXZpZ2F0b3IudXNlckFnZW50LmluZGV4T2YoIk1TSUUgOCIp ICE9IC0xKTsNCg0KZnVuY3Rpb24gRERQKHdyYXBwZWRFbGVtZW50KSB7DQogICAgdGhpcy5lbCA9 IHdyYXBwZWRFbGVtZW50Ll9fX2xpbms7DQogICAgdGhpcy5jcmVhdGVERFBDYW52YXMod3JhcHBl ZEVsZW1lbnQpOw0KfTsNCg0KRERQLnByb3RvdHlwZSA9IHsNCg0KICAgIGNyZWF0ZUREUENhbnZh czogZnVuY3Rpb24gKHdyYXBwZWRFbGVtZW50KSB7DQogICAgICAgIHZhciBlbCA9IHdyYXBwZWRF bGVtZW50Ll9fX2xpbms7DQogICAgICAgIGVsLmlubmVySFRNTCA9ICIiOw0KICAgICAgICBlbC5h cHBlbmRDaGlsZChkb2N1bWVudC5jcmVhdGVFbGVtZW50KCJESVYiKSk7DQogICAgfSwNCiAgICAN CiAgICBjcmVhdGVERFBCdWZmZXI6IGZ1bmN0aW9uICh3LCBoLCBydywgcmgpIHsNCiAgICAgICAg dmFyIGVsID0gdGhpcy5lbC5maXJzdENoaWxkOw0KICAgICAgICAgICAgaWYoIWlzSUU4KSB7DQog ICAgICAgICAgICBlbC5hcHBlbmRDaGlsZChkb2N1bWVudC5jcmVhdGVFbGVtZW50KCJUQUJMRSIp KTsNCiAgICAgICAgICAgIHZhciB0YmwgPSBlbC5maXJzdENoaWxkOw0KICAgICAgICAgICAgdGJs LnN0eWxlLmJvcmRlckNvbGxhcHNlPSJjb2xsYXBzZSI7DQogICAgICAgICAgICB0Ymwuc3R5bGUu Ym9yZGVyPSIwcHgiOw0KICAgICAgICAgICAgdGJsLnN0eWxlLndpZHRoPXc7DQogICAgICAgICAg ICB0Ymwuc3R5bGUuaGVpZ2h0PWg7DQogICAgICAgICAgICB2YXIgdHIsdGQ7DQogICAgICAgICAg ICBmb3IodmFyIGk9MDtpPHJoO2krKykgew0KICAgICAgICAgICAgICAgIHRyID0gZG9jdW1lbnQu Y3JlYXRlRWxlbWVudCgiVFIiKTsNCiAgICAgICAgICAgICAgICBmb3IodmFyIGo9MDtqPHJ3O2or KykgeyAgDQogICAgICAgICAgICAgICAgICAgIHRkID0gZG9jdW1lbnQuY3JlYXRlRWxlbWVudCgi VEQiKTsNCiAgICAgICAgICAgICAgICAgICAgdGQuc3R5bGUuYmFja2dyb3VuZENvbG9yID0gIiMw MDAwMDAiOw0KICAgICAgICAgICAgICAgICAgICB0ci5hcHBlbmRDaGlsZCh0ZCk7DQogICAgICAg ICAgICAgICAgfQ0KICAgICAgICAgICAgICAgIHRibC5hcHBlbmRDaGlsZCh0cik7DQogICAgICAg ICAgICB9DQogICAgICAgICAgICB0aGlzLnQgPSB0ci5wYXJlbnROb2RlOw0KICAgICAgICB9IGVs c2Ugew0KICAgICAgICAgICAgdmFyIHRhYmxlID0gJzx0YWJsZSBpZD0idHR0IiBzdHlsZT0id2lk dGg6Jyt3KydweDsgaGVpZ2h0OiAnK2grJ3B4OyBib3JkZXItY29sbGFwc2U6IGNvbGxhcHNlIj4n Ow0KICAgICAgICAgICAgdmFyIHRyLHRkOw0KICAgICAgICAgICAgZm9yKHZhciBpPTA7aTxyaDtp KyspIHsNCiAgICAgICAgICAgICAgICB0ciA9ICc8dHI+JzsNCiAgICAgICAgICAgICAgICBmb3Io dmFyIGo9MDtqPHJ3O2orKykgeyAgDQogICAgICAgICAgICAgICAgICAgIHRyID0gdHIgKyAnPHRk IHN0eWxlPSJiYWNrZ3JvdW5kLWNvbG9yOiAjMDAwMDAwIj48L3RkPic7DQogICAgICAgICAgICAg ICAgfQ0KICAgICAgICAgICAgICAgIHRhYmxlID0gdGFibGUgKyB0ciArICI8L3RyPiI7DQogICAg ICAgICAgICB9DQogICAgICAgICAgICB0YWJsZSA9IHRhYmxlICsgIjwvdGFibGU+IjsNCiAgICAg ICAgICAgIGVsLmlubmVySFRNTCA9IHRhYmxlOw0KICAgICAgICAgICAgdGhpcy50ID0gdGhpcy5l bC5maXJzdENoaWxkLmZpcnN0Q2hpbGQuZmlyc3RDaGlsZDsNCiAgICAgICAgfQ0KICAgIH0sDQog ICAgICAgIA0KICAgIHBpeGVsOiBmdW5jdGlvbiAoeCx5LCBjb2xvcikgeyAvLyBUT0RPOiBjaG9v c2UgYnVmZmVyIG51bWJlciENCiAgICAgICAgdGhpcy50LmNoaWxkTm9kZXNbeV0uY2hpbGROb2Rl c1t4XS5zdHlsZS5iYWNrZ3JvdW5kQ29sb3IgPSBjb2xvcjsNCiAgICB9LCANCiAgICAgICAgDQog ICAgZHJhdzogZnVuY3Rpb24gKGltZ2RhdGEsIHcsIHgsIHkpIHsNCiAgICAgICAgdmFyIGNvbG9y LCB4cG9zLCB5cG9zOw0KICAgICAgICBmb3IodmFyIGk9MDsgaTxpbWdkYXRhLmxlbmd0aDsgaSsr KSB7DQogICAgICAgICAgICB5cG9zID0gcGFyc2VJbnQoaS93KTsNCiAgICAgICAgICAgIHhwb3Mg PSBpICUgdzsNCiAgICAgICAgICAgIHRoaXMucGl4ZWwoeHBvcyt4LCB5cG9zK3ksIGltZ2RhdGFb aV0pOw0KICAgICAgICB9DQogICAgICAgIA0KICAgIH0NCn0NCg0KV0UgPSB7X19fbGluazogZG9j dW1lbnQuZ2V0RWxlbWVudEJ5SWQoInlvIil9Ow0KZCA9IG5ldyBERFAoV0UpOw0KDQpNWCA9IDMy MDsNCk1ZID0gMjQwOw0KSVggPSAzOw0KSVkgPSAzOw0KDQpkLmNyZWF0ZUREUEJ1ZmZlcigxMDAs MTAwLE1YLE1ZKTsNCg0KaW1nID0gWyAnIzAwMDBmZicsICcjZmZmZmZmJywgJyMwMDAwZmYnLA0K ICAgICAgICAnI2ZmZmZmZicsICcjZmZmZmZmJywgJyNmZmZmZmYnLA0KICAgICAgICAnIzAwZmYw MCcsICcjZmZmZmZmJywgJyMwMGZmMDAnXTsNCg0KYmxrID0gWyAnI2RlZGVkZScsICcjZGUwMGRl JywgJyNkZWRlMDAnLA0KICAgICAgICAnIzAwZGVkZScsICcjZGVkZWRlJywgJyMwMGRlZGUnLA0K ICAgICAgICAnI2RlZGUwMCcsICcjZGUwMGRlJywgJyNkZWRlZGUnXTsNCg0KYnIgPSBbICcjMDBm ZmZmJywgJyNmZjAwZmYnLCAnIzAwZmZmZicsDQogICAgICAgICcjMDBmZmZmJywgJyNmZmZmZmYn LCAnIzAwZmZmZicsDQogICAgICAgICcjMDBmZmZmJywgJyNmZjAwZmYnLCAnIzAwZmZmZiddOw0K DQogICAgICAgIA0KZC5kcmF3KGJyLCAzLCAzLDMpOw0KDQpkLmRyYXcoYnIsIDMsIDEzLDEzKTsN CmQuZHJhdyhiciwgMywgMTMsNDUpOw0KZC5kcmF3KGJyLCAzLCAxMyw3MCk7DQovL2QucGl4ZWwo MCwwLCcjZmYwMDAwJyk7DQovL2QucGl4ZWwoMTAsMTAsJyNmZjAwMDAnKTsNCi8vZC5waXhlbCgx NCwxNCwnI2ZmMDAwMCcpOw0KDQppeD0zOw0KaXk9MDsNCnZ4PTE7DQp2eT0tMjsNCg0KZnBzZGl2 ID0gZG9jdW1lbnQuYm9keS5hcHBlbmRDaGlsZChkb2N1bWVudC5jcmVhdGVFbGVtZW50KCJESVYi KSk7DQoNCmZ1bmN0aW9uIGRvX2xvb3AoKSB7DQogICAgZC5kcmF3KGJsaywgMywgaXgsIGl5KTsN CiAgICBpeCs9dng7DQogICAgaXkrPXZ5Ow0KICAgIGlmKGl4ID49IE1YLUlYKSB7DQogICAgICAg IGl4ID0gTVgtMS1JWDsNCiAgICAgICAgdnggPSAtdng7DQogICAgfQ0KICAgIGlmKGl4IDwgMCkg ew0KICAgICAgICBpeCA9IDA7DQogICAgICAgIHZ4ID0gLXZ4Ow0KICAgICAgICAvLyBjb21wdXRl IGZwcw0KICAgICAgICBkdCA9IChuZXcgRGF0ZSgpKS5nZXRUaW1lKCkgLSB0Ow0KICAgICAgICBm cHMgPSBNWC8oZHQvMTAwMCk7DQogICAgICAgIGZwc2Rpdi5pbm5lckhUTUwgPSAoIiBGUFM6ICIr ZnBzKTsNCiAgICAgICAgdCA9IChuZXcgRGF0ZSgpKS5nZXRUaW1lKCk7DQogICAgfQ0KICAgIGlm KGl5IDwgMCkgew0KICAgICAgICBpeSA9IDA7DQogICAgICAgIHZ5ID0gLXZ5Ow0KICAgIH0NCiAg ICBpZihpeSA+PSBNWS1JWSkgew0KICAgICAgICBpeSA9IE1ZLTEtSVk7DQogICAgICAgIHZ5ID0g LXZ5Ow0KICAgIH0NCiAgICBkLmRyYXcoaW1nLCAzLCBpeCwgaXkpOw0KICAgIA0KICAgIHNldFRp bWVvdXQoZG9fbG9vcCwgMSk7DQp9DQoNCnQgPSAobmV3IERhdGUoKSkuZ2V0VGltZSgpOw0Kc2V0 VGltZW91dChkb19sb29wLCAxMDApOw0KDQo8L3NjcmlwdD4NCg0KPC9ib2R5Pg0KPC9odG1sPg==