NEW 276580
[WPE][GTK] 100% CPU usage for simple CSS-only transform animation 
https://bugs.webkit.org/show_bug.cgi?id=276580
Summary [WPE][GTK] 100% CPU usage for simple CSS-only transform animation
Nils K
Reported 2024-07-13 18:26:36 PDT
The page https://display.soundtrackyourbrand.com/ results in full load on the CPU. Blink and Gecko do not suffer from this problem. We currently have this page in an iframe in a kiosk solution and it makes the whole browser sluggish (and also results in high CPU usage and a significant temperature increase compared to not embedding the site). We tested this on the most recent Cog and Epiphany releases.
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Antoine Quint
Comment 1 2024-07-15 04:34:01 PDT
I was curious so looked at macOS CPU usage and that page has the WebContent process sitting at about 11%, which isn't great but nothing like the report here.
Philippe Normand
Comment 2 2024-07-15 04:58:17 PDT
Here there's a CPU bottleneck due to GLFence::create().
Nils K
Comment 3 2024-07-15 06:54:33 PDT
I tested this on cog 0.18.3 (WPE WebKit 2.44.1) and epiphany 46.1 (WebKitGTK 2.44.2). The overall CPU usage of WPEWebProcess/WebKitWebProcess was 11-12% which corresponds to full CPU usage of a single core on my 8C/16T processor. Using taskset to pin the browser to a single core confirms that a single core is saturated at 100% usage
Nils K
Comment 4 2024-10-01 15:13:39 PDT
This is now drastically reduced on 2.46, I assume due to using Skia. I am not sure if you still want to investigate whether this can be improved for software rendering but feel free to close otherwise.
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