1448895 - Mouseover on https://bgrins.github.io/xbl-analysis/graph/ graphs is very slow

Status: NEW

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

Description

[Mayank Bansal]

Attachment: aboutsupport.txt

User Agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64; rv:61.0) Gecko/20100101 Firefox/61.0
Build ID: 20180325220121

Steps to reproduce:

1. Create new profile on nightly
2. Open https://bgrins.github.io/xbl-analysis/graph/
3. Scroll down to the bottom-most graph
4. Mouse-over the graph


Actual results:

the pop-up with info in very slow to render


Expected results:

not so

https://perfht.ml/2umnyrd

Comment 1

[Mayank Bansal]

profile with webrender enabled: https://perfht.ml/2umVuUM
It feels about the same as with WR disabled

Comment 2

[Lee Salzman [:lsalzman]]

Bas, can you make sense of the profile? Looks like we're just spending a lot of time inside D2D filling things, but that doesn't look out of the ordinary. Should we expect a case like this to be slow in D2D canvas?

Comment 3

[Bas Schouten (:bas.schouten)]

(In reply to Lee Salzman [:lsalzman] from comment #2)
> Bas, can you make sense of the profile? Looks like we're just spending a lot
> of time inside D2D filling things, but that doesn't look out of the
> ordinary. Should we expect a case like this to be slow in D2D canvas?

Based on the profile it looks like some type of complex clip is playing a role here. But we may be excessively pushing/popping that clip or something along those lines. Fwiw this performs -much- better in Edge, so obviously there's something we can do better here!

Comment 4

[Mayank Bansal]

https://share.firefox.dev/3yTMwhB

Comment 5

[Mayank Bansal]

This has improved significantly: https://share.firefox.dev/425LOZR (150ms per tick. previously it was 250ms per tick)
Chrome however is really fast here now