[Webkit-unassigned] [Bug 250829] New: MiniBrowser takes 12s to render https://www.wikipedia.org

bugzilla-daemon at webkit.org bugzilla-daemon at webkit.org
Thu Jan 19 02:29:45 PST 2023


https://bugs.webkit.org/show_bug.cgi?id=250829

            Bug ID: 250829
           Summary: MiniBrowser takes 12s to render
                    https://www.wikipedia.org
           Product: WebKit
           Version: Other
          Hardware: PC
                OS: Linux
            Status: NEW
          Severity: Major
          Priority: P2
         Component: WebKitGTK
          Assignee: webkit-unassigned at lists.webkit.org
          Reporter: antonio at vieiro.net
                CC: bugs-noreply at webkitgtk.org

# Platform:

- Ubuntu 22.04
- uname -srvmpio: Linux 5.15.0-10057-tuxedo #63tux3 SMP Thu Jan 12 14:42:43 UTC 2023 x86_64 x86_64 x86_64 GNU/Linux
- AMD Ryzen 7 5700U with Radeon Graphics / 64Gb RAM

# WebKitGTK versions

Happens on both
- libwebkit2gtk-4.0-37:amd64                       2.38.3-0ubuntu0.22.04.1                 amd64        Web content engine library for GTK
- libwebkit2gtk-4.1-0:amd64                        2.38.3-0ubuntu0.22.04.1                 amd64        Web content engine library for GTK

# Steps to reproduce:

1. Open https://www.wikipedia.org in MiniBrowser

$ /usr/lib/x86_64-linux-gnu/webkit2gtk-4.1/MiniBrowser https://www.wikipedia.org/

The system goes to 100% CPU on one of the cores during about 12 seconds. The core with high CPU changes over time. 

- MiniBrowser seems unresponsive while loading (resizing the window does not resize the webview).
- Once the page loads, resizing MiniBrowser's window seems to do some flickering, high CPU consumption. 
- NOTE: This page has several SVG images.

2. Close MiniBrowser and reopen with url https://webkitgtk.org/

$ /usr/lib/x86_64-linux-gnu/webkit2gtk-4.1/MiniBrowser https://webkitgtk.org/

- The page loads very fast.
- No observable flickering when resizing the window. Less CPU consumption.

3. Close MiniBrowser and reopen with url https://github.com/

$ /usr/lib/x86_64-linux-gnu/webkit2gtk-4.1/MiniBrowser https://github.com/

- The page loads not so fast, CPU has a 40-60% spike.
- Some observable flickering when resizing the window (webview resizing lags when resizing horizontally).

# Expected behaviour

All pages should load quickly :-).

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