[Webkit-unassigned] [Bug 180489] New: Page with Many Tables Takes About 4 Seconds to Display

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=180489

            Bug ID: 180489
           Summary: Page with Many Tables Takes About 4 Seconds to Display
           Product: WebKit
           Version: Safari Technology Preview
          Hardware: Unspecified
                OS: Unspecified
            Status: NEW
          Severity: Normal
          Priority: P2
         Component: Layout and Rendering
          Assignee: webkit-unassigned at lists.webkit.org
          Reporter: neil.here at gmail.com
                CC: bfulgham at webkit.org, simon.fraser at apple.com,
                    zalan at apple.com

Created attachment 328591

  --> https://bugs.webkit.org/attachment.cgi?id=328591&action=review

Webarchive of page with slow performance

A webpage with many tables takes about 4 seconds to render on my computer. The latest versions of Firefox and Chrome can both display the page within half a second.

The rendering/display process is slow enough that the Web Inspector stops showing process before the page is even displayed.

The issue does not seem to be (entirely?) style dependent; removing/excluding the CSS file has similar load times.

An example URL of a page that has slow performance is: https://www.fomopop.com/guides/live-tv-streaming/channels (this is also attached as a webarchive).

I'm testing on Safari Technology Preview Release 45 (Safari 11.1, WebKit 13605.1.15.2). My machine is a MacBook Pro (15-inch, Late 2016) running 10.13.1 (17B1003).

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