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Perhaps this is already fixed and will be applied in a coming update (since I see no evidence of this bug in Henri's Chrome extension pages which feature PS2 content) but for me it is very common (across different browsers and operating systems) for the video thumbnails on profile pages and the homepage to begin to stutter. In fact, I don't know if I've ever had a browsing session where I did not encounter this, either on Windows or Mac.
Behavior changes from one page load to another as to whether it happens immediately or after looping a time or two or goes away when panned over to another synth's thumbnail or remains when doing so, but the overall impression is pretty glitchy and that's an unfortunate first impression.
I'm hoping that this can be ironed out in the not too distant future.