It doesn't matter which driver do I use for glxgears to be slow like this.
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~ glxgears -info GL_RENDERER = Gallium 0.4 on llvmpipe (LLVM 3.9, 128 bits) 25 frames in 5.0 seconds = 4.985 FPS
After some time it gets to 24fps and takes ~80% cpu (in the default, very small-sized window, for maximised 1920x1080 it is 1fps)
Nothing is hardware accelerated but code with #include "bcm_host.h"
(i.e. omxplayer and /opt examples) and that is bound to the legacy driver as we know.
So we cannot play games, use blender, program anything with gpu support convieniently (e.g. qt) etc.
Months from Stretch's release have passed and I'm thinking of going back to Jessie where (more) things worked as expected.
If we were to compile things ourselves, one could just choose gentoo