[Webkit-unassigned] [Bug 167561] New: Sluggish/slow scroll on some webpages

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=167561

            Bug ID: 167561
           Summary: Sluggish/slow scroll on some webpages
    Classification: Unclassified
           Product: WebKit
           Version: Safari Technology Preview
          Hardware: Macintosh
                OS: macOS 10.12
            Status: NEW
          Severity: Normal
          Priority: P2
         Component: Layout and Rendering
          Assignee: webkit-unassigned at lists.webkit.org
          Reporter: fload at me.com
                CC: bfulgham at webkit.org, simon.fraser at apple.com,
                    zalan at apple.com

Created attachment 300069
  --> https://bugs.webkit.org/attachment.cgi?id=300069&action=review
An example of a WebSite with a sluggish scroll (WebArchive and HTML)

First let me apologise in advance for duplicate bugreport if any. In particular this bug might be related to #165196.

Some WebPages (I have attached an example, but I don't know any public site with this problem) have a very sluggish scroll on the latest (late 2016) retina MacBook Pro w/ Touch Bar, when it works fine in Chromium & Firefox.
It is not a problem related to JavaScript as the scroll is as sluggish with JavaScript off.

I've joined the WebPage in two formats (Safari WebArchive & pure HTML).
For both formats, you’ll have to disable JavaScript for the content to stay in the page.

I can join another example of a WebPage with this sluggish scroll if needed.

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