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I don't know why, but just the animated background causes 100% cpu consumption for me. Debian 12, Chromium 136, i5-3450, 20gb ram, nVidia 3080, 4k screen though.

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Sounds like partial lack of GPU acceleration on your linux side of things?

You can check with going to

chrome://gpu

(I assume for chromium it is the same adress as for chrome)

That is odd, perhaps the browser is not using your GPU and instead trying to run fully on the CPU. I have an issue on GitHub where another user reported this in Firefox. I assume changing to a picture wallpaper like APOD fixes the issue then?

Yes, with static image CPU consumption goes to ~0%. chrome://gpu says:

Graphics Feature Status

=======================

* Canvas: Hardware accelerated

* Direct Rendering Display Compositor: Disabled

* Compositing: Hardware accelerated

* Multiple Raster Threads: Enabled

* OpenGL: Enabled

* Rasterization: Hardware accelerated on all pages

* Raw Draw: Disabled

* Skia Graphite: Disabled

* Video Decode: Hardware accelerated

* Video Encode: Software only. Hardware acceleration disabled

* Vulkan: Disabled

* WebGL: Hardware accelerated

* WebGL2: Hardware accelerated

* WebGPU: Disabled

* WebNN: Disabled

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