So did you take any other solution? I was thinking about renting or collocating server with gpu and just automate whole process with ansible&#x2F;fabric or just vnc.
About exentions - thats true. I was able to run software rending for shaders (llvm, xvfb, ec2), framerate was acceptable (1-5 fps, which is more than fine for screenshots), but issues like having max anisotropy = 1 make it unusable for this use case.