[Webkit-unassigned] [Bug 278695] New: [GTK] WebGL: slow framerate, sluggish panning on the F4 demo 3D map of Paris with lots of trees

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=278695

            Bug ID: 278695
           Summary: [GTK] WebGL: slow framerate, sluggish panning on the
                    F4 demo 3D map of Paris with lots of trees
           Product: WebKit
           Version: WebKit Nightly Build
          Hardware: PC
                OS: Linux
            Status: NEW
          Severity: Normal
          Priority: P2
         Component: WebKitGTK
          Assignee: webkit-unassigned at lists.webkit.org
          Reporter: nekohayo at gmail.com
                CC: bugs-noreply at webkitgtk.org

Here's an interesting benchmark where Epiphany TP (Skia, WebKitGTK 2.45.90, GTK 4.15.6) + 46.3, and WebKitGTK6's MiniBrowser are all much slower than Chromium:

1. Open https://demo.f4map.com/#lat=48.8525728&lon=2.3478009&zoom=16&camera.theta=43.854&camera.phi=24.064
2. Wait 20 seconds for all the buildings _and all the trees_ to load
3. Click and drag to pan around (don't zoom in, stay zoomed out at the wide view from that URL)

Result: it's sluggish, feels like 10-20 fps. Comparatively, Chromium manages to drag it butter-smooth, at what feels like 40-60 fps.

Demonstration video (Epiphany TP vs Chromium): https://youtu.be/HB0l8BoacEg

This was tested on Fedora 40's Wayland GNOME Session with:

* My desktop with open source AMD Radeon R9 270 Mesa 24.1.6 drivers, kernel 6.10.4, a Xeon CPU, and 24 GB of RAM.
* My laptop with Intel Kabylake graphics, i5 CPU and 24 GB of RAM

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