Patrick Brosset <:pbro> Reporter
	Description • 8 years ago

This page has horrible performance pretty much everywhere, but for the purpose of this bug, I tested on FF46 with e10s enabled:

- open http://holohalo.net/
- scroll around

Scrolling is really slow and janky
Some of the background images that are rotating in the SVG animations on the page flicker really rapidly when you scroll.

	Patrick Brosset <:pbro> Reporter
	Comment 1 • 8 years ago

Oh, I was testing on Windows 10, but :smaug tested on Linux and confirmed the performance problem.

The first time I tested this site, it made the content process crash, but I wasn't able to reproduce this ever since. And it happened right when I opened devtools.

	u279076
	Comment 2 • 8 years ago

I get the same jankiness in Firefox 40 and Chrome 48. I'm not sure this is a bug in our code.

	Kartikaya Gupta (email:kats@mozilla.staktrace.com)
	Comment 3 • 8 years ago

In my local debug build (with a couple of unrelated patches applied) loading this page hits an assertion failure and crashes.

	Kartikaya Gupta (email:kats@mozilla.staktrace.com)
	Comment 4 • 8 years ago

I'll look into the assertion failure, it might lead somewhere interesting.

	Kartikaya Gupta (email:kats@mozilla.staktrace.com)
	Comment 5 • 8 years ago

This includes the layer dump. There are container layers which have metrics with scrollId=2, but they have child container layers which also have metrics with scrollId=2. Presumably that's where the problem is coming from.

	Markus Stange [:mstange]
	Comment 6 • 8 years ago

Can you attach a display list dump?

	Kartikaya Gupta (email:kats@mozilla.staktrace.com)
	Comment 7 • 8 years ago

Yup, here you go. Hopefully there's no parent process output interleaved in here - I didn't see any but I have missed something.

	Markus Stange [:mstange]
	Comment 8 • 8 years ago

Thanks. There is blend stuff in there, so I think this is bug 1239304, for which I have a wip fix. I'll test that fix on this page when I get a chance.