[Webkit-unassigned] [Bug 181244] New: Slow drawing to canvas with drawImage
bugzilla-daemon at webkit.org
bugzilla-daemon at webkit.org
Wed Jan 3 07:32:26 PST 2018
https://bugs.webkit.org/show_bug.cgi?id=181244
Bug ID: 181244
Summary: Slow drawing to canvas with drawImage
Product: WebKit
Version: Safari 11
Hardware: All
OS: macOS 10.13
Status: NEW
Severity: Normal
Priority: P2
Component: Canvas
Assignee: webkit-unassigned at lists.webkit.org
Reporter: matt.sephton at gmail.com
CC: dino at apple.com
Created attachment 330385
--> https://bugs.webkit.org/attachment.cgi?id=330385&action=review
screenshot: safari
Summary:
I am drawing many small 8x8 tiles onto the canvas.
I am seeing poor performance in Safari/TP compared to Chrome.
Steps to Reproduce:
Go to : http://www.gingerbeardman.com/pangds/
Press the left/right arrows to change display
Inspect console for timings.
Expected Results:
Drawing should be instantaneous.
Actual Results:
Drawing is very slow.
Seems to be CPU/GPU bound as performance varies between computers.
MBP 10,2 (early 2013; 3.0 GHz Intel Core i7):
Safari 11.0.2 @350ms
Safari TP 46 @450ms
Chrome @65ms
Version:
ProductName: Mac OS X
ProductVersion: 10.13.2
BuildVersion: 17C88
Safari 11.0.2 (13604.4.7.1.3)
Safari TP 46 11.1 (13605.1.18.2)
Chrome (63.0.3239.108)
<rdar://problem/31834934>
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