Over on the Collabora blog, Marius Vlad has an overview
of Weston 15.0, which was released on February 19.  Weston is the
reference implementation of a Wayland compositor.  The new
release comes with a new shell that can be programmed using the Lua language, a
new, experimental Vulkan
renderer, smoother media playback, color-management additions, and more.

One of Weston's fundamental pillars has always been making the most efficient
use of display hardware. Over time, all the work we did to track and offload as
much work as possible to this efficient fixed-function hardware has come at the
cost of eating CPU time. In the last couple of release cycles, we've focused
really hard on improving performance on even the most low-end of devices, so not
only do we make the most efficient use of the GPU and display hardware, but
we're also really kind on your CPU now. As part of that and to improve our
tooling, Weston 15 now comes with support for the Perfetto profiler.

https://lwn.net/Articles/1059933/
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