1438942 - Extremely slow sideways scrolling on airtable.com

Status: RESOLVED FIXED

(Core :: Graphics: WebRender, defect, P1)

Description

[Markus Stange [:mstange]]

https://airtable.com/shrRydo6UXhebLShj/tblc2X4kICL8NGzG5

All the time is spent on the main thread during memory allocation from DrawTargetRecording::PushLayer + deallocation in ~DrawEventRecorderMemory.

Comment 1

[Markus Stange [:mstange]]

Profile: https://perfht.ml/2C3mX0O

Comment 2

[Markus Stange [:mstange]]

Profile: https://perfht.ml/2o4eaTK

Comment 3

[Jeff Muizelaar [:jrmuizel]]

Adding a svg.icon { display: none } fixes the problem.

There are around a 100 of these svg.icon's

However, it seems like we shouldn't be hurting so much from them.

Comment 4

[Jeff Muizelaar [:jrmuizel]]

The blob size of some of these is >1MB that's not great.

Comment 5

[Markus Stange [:mstange]]

Attachment: testcase

We're creating large mask layers for the BasicContainerLayer for the viewbox transform in each SVG element, because the SVG is clipped by a large rounded corner box.

However, the SVG element itself is very small and does not intersect the rounded corners.

Comment 6

[Jeff Muizelaar [:jrmuizel]]

I believe this is fixed by blob invalidation

Comment 7

[Jeff Muizelaar [:jrmuizel]]

This is just blocked on script now.

Comment 8

[Jeff Muizelaar [:jrmuizel]]

I filed bug 1455187 for the remaining slowness