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comment by aerobatic
aerobatic  ·  3390 days ago  ·  link  ·    ·  parent  ·  post: Can You Keep Perfect Time? Take This Test And Find Out!

Don't worry about getting 1000. USB keyboard response times have a standard deviation of 2.5-10ms, so anything above 900 is about as perfect as the computer can measure.

There is also some timing variation inherent by measuring with javascript, though I'm not sure how much.

EDIT: Got curious and looked into it some more - even 1000Hz gaming mice have a 1.8ms SD. http://www.ncbi.nlm.nih.gov/pmc/articles/PMC4374455/

I'm using SD rather than mean response time since it is more relevant to rhythm.