https://bugs.freedesktop.org/show_bug.cgi?id=106187
--- Comment #8 from Alex Deucher <alexdeuc...@gmail.com> ---
There is extra overhead when using secondary GPUs in conjunction with prime
when you want to see the results on the display. The display is only attached
to one GPU so when you render with the other GPU, the contents have to be
copied to the GPU with the display in order to see the results.
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