I don't know much about AMD GPUs but from what I've seen there is
usually only one kernel graphics driver that works for a given GPU.

After you have switched back to a 'stock' config and kernel, what does
vulkaninfo report? Does the "bad performance" persist?

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https://bugs.launchpad.net/bugs/1975566

Title:
  radeon / amdgpu bad performance or panics

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