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Enabling WebGL works. My three tests scored 8.7, 6.7 and 6.3 respectively. I guess Safari, like me, hates repetitive tasks. :)

:) There is a lot of run-to-run variance. Some of it is real in that browsers do give different results, and some of it is just test noise. I'm still working on improving the robustness. Recently I've been working on hardware latency measurement which gives more reliable numbers.

I do have WebGL enabled, and it can't pick up the test pattern.

I also get "Failed to find test pattern on screen." in Safari with WebGL enabled on a Mid 2011 Mac Mini running 10.9 with dual monitors. View is set to "Actual Size", and I've tried moving the Safari window between monitors.

Other scores - Chrome 30: 2.4/10. Firefox 24 and 25: 1.2/10.