Make the cookie timing check hold on fast cores

The quadratic trim takes 0.58 seconds for the 20,000 spaces the check
used under LuaJIT on an M-series Mac, against a threshold of half a
second over two calls, so a regression could pass on a slightly faster
core. At 100,000 spaces it takes about fifteen seconds and the linear
one under a millisecond, and each call is now timed on its own.

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