[Webkit-unassigned] [Bug 274862] New: [Unified PDF] pages are blank/white for 3-10s after scrolling quickly in 2-up

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=274862

            Bug ID: 274862
           Summary: [Unified PDF] pages are blank/white for 3-10s after
                    scrolling quickly in 2-up
           Product: WebKit
           Version: WebKit Nightly Build
          Hardware: Unspecified
                OS: Unspecified
            Status: NEW
          Severity: Normal
          Priority: P2
         Component: PDF
          Assignee: webkit-unassigned at lists.webkit.org
          Reporter: simon.fraser at apple.com
                CC: a_protyasha at apple.com

Pages are blank/white for 4-10s after scrolling quickly, in 2-up.

https://help.apple.com/pdf/applestyleguide/en_US/apple-style-guide.pdf
- right-click, switch to ‘Two pages continuous’ (2-up) view
- 2-finger-scroll on the trackpad 2-3 times: ~10-20 pages; i.e quickly scroll to somewhere in the middle of the document, or even to the end.
-> pages are blank for quite a while, takes up to ~10s for them to render (on M3 Max). The further you scroll, the longer it takes. At first pixellated/blurry, then turn sharp after another ~0.5-1s.

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