Closed Bug 1117322 Opened 11 years ago Closed 4 years ago

Reflow / scrolling performance has regressed in Firefox 36

Categories

(Firefox :: PDF Viewer, defect, P3)

Product:
Firefox
Component:
PDF Viewer
Version:
36 Branch
Platform:
x86_64
Windows 7
Type:
defect

Tracking

()

Status:
RESOLVED WORKSFORME

People

(Reporter: l_l, Unassigned)

Details

(Keywords: perf, regression, Whiteboard: [pdfjs-c-performance])

STR: 1. download http://www.etsi.org/deliver/etsi_ts/151000_151099/15101001/10.03.00_60/ts_15101001v100300p.pdf (5000+ pages pdf file) 2. Open the file in the PDF.JS viewer (http://mozilla.github.io/pdf.js/web/viewer.html) 3. Open PDF.JS's sidebar (leftmost button in the toolbar) 4. hold down the '↓' key to scroll down through the pages FF 34 takes 1:01 minutes to scroll through the first 50 pages FF aurora 36.a2 takes 1:50 minutes to scroll through the first 50 pages, Each time a new page is rendered, the update of thumbnail images causes a reflow of the DOM tree (~40000 Elements). It's that reflow which was a lot of faster in FF34. Related: https://github.com/mozilla/pdf.js/pull/5586
Priority: -- → P3
Whiteboard: [pdfjs-c-performance]
Status: UNCONFIRMED → NEW
Ever confirmed: true
FF 35 is still good, FF 37.0a2 is still bad.
Summary: Reflow / scrolling performance has regressed → Reflow / scrolling performance has regressed in Firefox 36

works for me Mozilla/5.0 (Windows NT 10.0; Win64; x64; rv:97.0) Gecko/20100101 Firefox/97.0

I cannot reproduce a difference between 34.0a1 and 37.0a2 either. (with mozregression and Win10)

Status: NEW → RESOLVED
Closed: 4 years ago
Resolution: --- → WORKSFORME
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