245427 2022-09-20 08:17:23 -0700 [GTK] High CPU usage when the browser window is in the background 2022-12-15 03:17:55 -0800 1 1 1 Unclassified WebKit WebKitGTK WebKit Nightly Build Unspecified Unspecified NEW P2 Normal --- 1 berto webkit-unassigned bugs-noreply mcatanzaro svillar zan oldest_to_newest 1899818 0 berto 2022-09-20 08:17:23 -0700 I'm using epiphany 3.38.2 to access a chat webapp, which I normally have open but in the background when I'm not using it. Since I upgraded to WebKitGTK 2.38.0 I notice that the browser starts to use a lot of CPU when it should be mostly idle. The problem seems to happen (this is my guess) when there's new activity in the chat room and disappears when I focus the browser window. perf-top shows fast_composite_scaled_bilinear_sse2_8888_8_8888_none_OVER as the top symbol in the UI process, and the web process is constantly running different WebCore and JSC functions. 1899844 1 berto 2022-09-20 09:40:42 -0700 hmmm I'm not so sure that this didn't happen with 2.36 already... 1900328 2 zan 2022-09-22 01:27:54 -0700 (In reply to Alberto Garcia from comment #0) > I'm using epiphany 3.38.2 to access a chat webapp, which I normally have > open but in the background when I'm not using it. > Possible to reproduce with MiniBrowser? 1900584 3 berto 2022-09-23 03:07:25 -0700 (In reply to Zan Dobersek from comment #2) > Possible to reproduce with MiniBrowser? Yes, here's perf-top --sort=comm,dso UI process: 46.14% MiniBrowser libc-2.31.so 25.47% MiniBrowser libpixman-1.so.0.40.0 6.17% MiniBrowser radeonsi_dri.so 5.37% MiniBrowser [kernel] 3.55% MiniBrowse:cs0 [kernel] 3.03% MiniBrowser libcairo.so.2.11600.0 1.98% MiniBrowser libglib-2.0.so.0.6600.8 1.38% MiniBrowser libgtk-3.so.0.2404.20 1.24% MiniBrowser libgdk-3.so.0.2404.20 0.71% MiniBrowser libgobject-2.0.so.0.6600.8 0.59% MiniBrowser libwayland-server.so.0.1.0 [...] Web Process: 18.05% eadedCompositor radeonsi_dri.so 16.01% WebKitWebProces [kernel] 14.36% eadedCompositor libwebkit2gtk-4.0.so.37.57.3 13.94% WebKitWebProces libc-2.31.so 8.03% WebKitWe:gdrv0 radeonsi_dri.so 6.26% WebKitWebP:cs0 [kernel] 4.69% eadedCompositor [kernel] 3.55% ReceiveQueue libjavascriptcoregtk-4.0.so.18.21.3 2.38% WebKitWebProces libwebkit2gtk-4.0.so.37.57.3 1.68% eadedCompositor libc-2.31.so 1.43% eadedCompositor libjavascriptcoregtk-4.0.so.18.21.3 [...] 1900594 4 svillar 2022-09-23 04:14:59 -0700 FWIW I'm getting similar results with epy 42.4 but I've been observing this for a while. This is the perf top for the epiphany process alone 31,98% epiphany libpixman-1.so.0.40.0 16,62% epiphany libc.so.6 3,18% epiphany [kernel] 2,25% epiphany libcairo.so.2.11600.0 1,22% epiphany iris_dri.so 0,96% epiphany libglib-2.0.so.0.7200.3 0,87% epiphany libgtk-3.so.0.2404.30 0,45% epiphany libgdk-3.so.0.2404.30 0,34% epiphany libgobject-2.0.so.0.7200.3 0,13% epiphany [unknown] WebProcess is low in the list of global offenders with ~2% of total CPU usage. 1919510 5 berto 2022-12-15 03:17:55 -0800 Still happening with 2.39.3