1591634 - Performance cliff on arewefluentyet.com

Status: RESOLVED FIXED

(Core :: Graphics: Canvas2D, defect, P3)

Description

[Zibi Braniecki [:zbraniecki][:gandalf]]

This has been originally reported as https://github.com/projectfluent/arewefluentyet.com/issues/10

Steps to reproduce:

1. Open https://arewefluentyet.com/
2. Move your mouse from left edge of the graph to the right, and back

Current result:

At some point the graph chokes and the CPU usage spikes and the browser hangs

Expected result:

Normal behavior

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This is not reproducible in Chrome or Safari.

Comment 1

[Timothy Nikkel (:tnikkel)]

When I test with webrender I get a smaller version of the graph offset and super imposed on the page.

Comment 2

[Nicolas Silva [:nical]]

This bug appears to have been initially reported on windows with the Direct2D backend, however on linux with skia software I also see the smaller version of the graph and bad performance, most of the time being spent in gfx::AplhaBloxBlur to render some text with shadows, which is odd looking at the rendered graph.
The issue with D2D might be different (I don't have the windows machine to test handy).

Comment 3

[Timothy Nikkel (:tnikkel)]

I was testing on mac. Without webrender I do not see the smaller version of the graph, but I see the bad performance with and without webrender.

Comment 4

[Vasyl Solovei]

When I test(In reply to Timothy Nikkel (:tnikkel) from comment #1)

When I test with webrender I get a smaller version of the graph offset and super imposed on the page.

Getting the same result while repeatedly moving mouse fast from left to right.

Comment 5

[Eemeli Aro [:eemeli]]

This was fixed on the site with this change.