Firefox Performance very poor for Percippet

The Percippet snippet in Firefox is slower than on Chromium.

Improvements

Several area that produce overall speed up:

• Property accessors gets used excessively in loops
• Pulled out of loops repeated computations
• Matrix loops to avoid access the outer index in the inner loop.
• Unnecessary duplication of .slice(...) for an argument that came from an already sliced array
• Use of ternary instead of global Number based cast for true and false as 1 and 0 - benchmark

What to change

See the list above.

Hints for testers

• make sure the snippet still work as expected
• verify that the performance difference between Chromium and Firefox is narrower.