Awesome achievement, but like most OpenGL bridge techniques, 15fps with artifacts is not usable.
For me, it is completely fine. I just develop some softwares with little graphics load, and use Web applications and watch some videos.
You have no luck here if you are going to play modern games, but modern proprietary game engines do not support AArch64 Linux anyway. It would be difficult time for Linux desktop if other PC vendors migrate to AArch64.
Note that I haven't really optimized it yet. Certainly there should be low-hanging fruits, but I don't dare to get them as it is good enough for me as GNOME is no longer laggy and I know some overheads cannot be eliminated.
If I have to do graphics-intensive workload, I would simply run it on macOS or buy another accelerator as M1 is not the best performant graphics accelerator in the market anyway.
He gets 700fps and close to OpenGL benchmarks he runs...