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gtk4: enabling x11glx feature increase CPU usage

While discussing with @slomo and @philn I've been told I can safely enable the x11egl, x11glx and wayland features in my application.

But on my desktop enabling x11glx actually significantly increase CPU usage, which is the opposite of the expected result.

  • cargo run --release --example gtksink uses about 20% CPU
  • cargo run --release --features=x11glx --example gtksink uses around 40%

In both cases I get this error:

libEGL warning: DRI3: Screen seems not DRI3 capable
libEGL warning: DRI2: failed to authenticate

This is on a F39 Silverblue host, running in a F37 toolbox container. I have Nvidia RTX 4080 and I'm still using X11 because of that.

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