I mean we need to bisect the problem further. So far it has only been
narrowed to Wayland on Ubuntu with Nvidia, and is not specific to any
compositor. So calling this an Ubuntu bug would require proving it's a
bug in the Nvidia driver/libraries, or that it's a bug in the common
Wayland protocol libraries. The former requires proving it's not a bug
on Intel or AMD drivers, and the latter requires proving there's
something wrong with the protocol implementation itself.

Most likely you're heading toward having a bug to report to Nvidia, but
they would need a very condensed explanation of what is specifically
wrong with their driver and where. Also it would be a waste of your own
time if it turned out other GPU vendors had the same issue.

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https://bugs.launchpad.net/bugs/2114234

Title:
  Vulkan performance under Wayland/X11 and NVidia drivers

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