Bug 322024

Testing with Epiphany 50.4 with Fedora 44's GNOME 50.4 Wayland session on Intel graphics (Kabylake chipset with Core i5-8350U × 8 processor), CPU usage on some of Wise.com's pages is suspiciously high, even though no animation (or videos, or anything visual) is happening above the fold. This happens even in a private browser window. ## To reproduce I have tested mainly the https://wise.com front page, and the https://wise.com/business/ sub-page. Below are links using archive.org to ensure we are testing the same thing over time: * https://web.archive.org/web/20260731214409/https://wise.com/ * https://web.archive.org/web/20260315115558/https://wise.com/business/ (a bit incomplete of an archive, but still triggers about 20% undivided CPU usage) 1. Run one of these two commands: epiphany -i https://web.archive.org/web/20260731214409/https://wise.com/ epiphany -i https://web.archive.org/web/20260315115558/https://wise.com/business/ …and wait for it to load. In the case of the 1st link, if using the archive.org link, you will have to scroll down just a tiny bit (ex: 100 pixels or so) to trigger it to show the text contents etc., then you can press "Esc" to cancel loading the rest (because archive.org is so slow that it might be endless). Alternatively, you can just open a new private window in an already running Epiphany instance, size down the window height to something like 600 px (to be sure you won't see the autoplaying video on the website), and load the https://wise.com front page directly. If loading the front page and the video is visible and starts autoplaying, pause it. 2. While that tab / window is focused/visible, observe CPU usage in your system monitor (ex: gnome-system-monitor, or Resources), setting it to not divide it by the number of logical CPUs. ## Actual results In GNOME System Monitor, the undivided CPU usage of WebKitWebProcess for those pages is: * Constantly 40 to 100% in the 1st case (home page). 40% when using the archive.org link, 100% when going directly to wise.com * 15 to 25% in the 2nd case ("business" page) Looking at intel_gpu_top, it seems like the "Video" decoder is constantly in use on the wise.com front page, even if you loaded a tiny private window that does not actually show any visible video.