Raspberry Pi CM4 High CPU usage

[jeromelaban]

In my app that runs on Raspberry Pi CM4 on a 800x480 touchscreen my application is typically using around 40% CPU time when idle.

There's really no processing done (listening on some sockets, etc), so without much investigation I think it's the Skia rendering that is using most of the CPU time. On Windows I don't see this (but my Windows PC is quite high performance). I'm using X11 and to my knowledge it's using the acceleration. The only thing that happens on the screen is a clock that updates (via binding) once per second.
My question is if this is normal or if something is wrong? Sometimes I need to do some low-latency processing (recording a network stream) where timing is critical, is it possible to slow down the Skia screen updates (if that's what's consuming the CPU time)? When recording I only updated a duration label every 500ms with an option to Abort/Save (buttons).

Originally posted by @HakanL in #19038

[jeromelaban]

Thanks @HakanL.

Can you specify which version of Uno you're using? and does it happen also using 5.6-dev builds?

[HakanL]

@jeromelaban I'm using 5.6.0-dev.264 of the Uno.Sdk with single project and Desktop. But I feel this has been going on for a while, I'm more trying to understand how the rendering works and if I've done something wrong in how I'm using it or what to expect.