Issue 865894 link

Starred by 3 users

Issue metadata

Status:	Assigned
Owner:	alph@chromium.org
Components:	Platform>DevTools>Performance
EstimatedDays:	----
NextAction:	----
OS:	----
Pri:	3
Type:	Bug

Misleading paint size

Project Member Reported by jakearchibald@chromium.org, Jul 20

Issue description

http://output.jsbin.com/pazipo/quiet

1. Go to performance tab.
2. Make a brief recording.
3. See "paint entries".

The paint entry suggests the entire viewport has been painted, whereas paint flashing shows the reality - only a small area is repainted.

	Screen Shot 2018-07-20 at 10.36.37.png 384 KB View Download

http://output.jsbin.com/pazipo/quiet

1. Go to performance tab.
2. Make a brief recording.
3. See one of the paint entries.

The paint entry suggests the entire viewport has been painted, whereas paint flashing shows the reality - only a small area is repainted.