1321751 - Eyedropper movement is laggy in Firefox 50

Status: RESOLVED FIXED

(DevTools :: Inspector, defect, P3)

Description

[Aniket Kudale [:aniketk]]

User Agent: Mozilla/5.0 (Windows NT 10.0; WOW64; rv:50.0) Gecko/20100101 Firefox/50.0
Build ID: 20161104212021

Steps to reproduce:

1. Open Menu
2. Click Developer Tools
3. Click Eyedropper.

Try moving it, you can see the lag.

Comment 1

[YF (Yang)]

Regression window (not final):
https://hg.mozilla.org/mozilla-central/pushloghtml?fromchange=7c669d5d63efceb12696cd65cfa72c296013dafb&tochange=e730a1dca1a41bd6b0824353305abc25284e2d52


Actual result:
When you quickly move the mouse, you can see the mouse pointer flashes.

Comment 2

[Julian Descottes [:jdescottes]]

I can't really reproduce the issue on Windows 7, the eyedropper feels smooth enough in my opinion. 
Could you add a screen recording of the issue? What kind of hardware are you testing this on?

Comment 3

[Aniket Kudale [:aniketk]]

It is smooth enough when you mouse slowly, but when you quickly move the mouse, you can see the mouse pointer flashes.

Comment 4

[Julian Descottes [:jdescottes]]

Testing a bit more, I feel like this depends on the page where you use the colorpicker.

I can't reproduce it on a regular webpage, but I do have very bad performances on about:debugging, about:tabcrashed etc ...
Aniket, do you see this on any webpage? To be sure a link of a page where you see the issue would be great.

Comment 5

[Liz Henry (:lizzard) (relman/hg->git project)]

Too late for a fix for 53, as we are in the last week of the 53 beta cycle.

Comment 6

[Julian Descottes [:jdescottes]]

Can't reproduce this on any page with FF61. Closing. If this still occurs for you, please add a URL where this issue occurs.

Comment 7

[YF (Yang)]

Attachment: video

This problem is still reproducible with the latest Nightly.