210571 2020-04-15 14:09:07 -0700 DidFirstLayerFlush IPC can be head-of-line-blocked and delay first paint by 200+ ms on process swap 2020-04-15 22:44:36 -0700 1 1 1 Unclassified WebKit Layout and Rendering WebKit Nightly Build Unspecified Unspecified RESOLVED FIXED InRadar P2 Normal --- 1 nham nham ap bfulgham cdumez ggaren koivisto nham simon.fraser thorton webkit-bug-importer zalan oldest_to_newest 1641971 0 nham 2020-04-15 14:09:07 -0700 DidFirstLayerFlush IPC can be head-of-line-blocked and delay first paint by 200+ ms on process sawp 1641972 1 396571 nham 2020-04-15 14:14:05 -0700 Created attachment 396571 Patch 1641975 2 nham 2020-04-15 14:14:50 -0700 <rdar://problem/61755552> 1641976 3 webkit-bug-importer 2020-04-15 14:15:08 -0700 <rdar://problem/61847651> 1641977 4 396574 nham 2020-04-15 14:16:09 -0700 Created attachment 396574 Patch 1641984 5 396574 ggaren 2020-04-15 14:20:00 -0700 Comment on attachment 396574 Patch r=me Seems like a great way to fix this particular issue (even without adding a general priority mechanism to task scheduling). I'll wait for Tim and Simon to tell me why I'm wrong :P. 1641987 6 396576 nham 2020-04-15 14:26:31 -0700 Created attachment 396576 Patch 1642018 7 396584 nham 2020-04-15 15:54:57 -0700 Created attachment 396584 Patch for landing 1642032 8 ews-feeder 2020-04-15 16:18:05 -0700 Committed r260158: <https://trac.webkit.org/changeset/260158> All reviewed patches have been landed. Closing bug and clearing flags on attachment 396584. 1642152 9 koivisto 2020-04-15 22:44:36 -0700 Note that I have a patch in https://bugs.webkit.org/show_bug.cgi?id=208413 for general RunLoop priorities if we want to do something more generic. 396571 2020-04-15 14:14:05 -0700 2020-04-15 14:16:07 -0700 Patch bug-210571-20200415141404.patch text/plain 2526 nham U3VidmVyc2lvbiBSZXZpc2lvbjogMjYwMDU5CmRpZmYgLS1naXQgYS9Tb3VyY2UvV2ViS2l0L0No YW5nZUxvZyBiL1NvdXJjZS9XZWJLaXQvQ2hhbmdlTG9nCmluZGV4IDhiMTM4YWExZDE3MzAzODRh ZTJiYTU0ZjM4ZGE0ZTU3YzgxZjYxY2YuLmRlZWQ3MTQyMjA2MGNiZjMxODA1Yjk4MWQxN2ZjNDFj YmVmZjIyZTcgMTAwNjQ0Ci0tLSBhL1NvdXJjZS9XZWJLaXQvQ2hhbmdlTG9nCisrKyBiL1NvdXJj ZS9XZWJLaXQvQ2hhbmdlTG9nCkBAIC0xLDMgKzEsMjIgQEAKKzIwMjAtMDQtMTUgIEJlbiBOaGFt ICA8bmhhbUBhcHBsZS5jb20+CisKKyAgICAgICAgRGlkRmlyc3RMYXllckZsdXNoIElQQyBjYW4g YmUgaGVhZC1vZi1saW5lLWJsb2NrZWQgYW5kIGRlbGF5IGZpcnN0IHBhaW50IGJ5IDIwMCsgbXMg b24gcHJvY2VzcyBzYXdwCisgICAgICAgIGh0dHBzOi8vYnVncy53ZWJraXQub3JnL3Nob3dfYnVn 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