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Created June 1, 2019 11:38
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foo.md 
tools/speedup.p6 10 6
1.67x as fast

Given:
old-time     = 10
new-time     = 6
old-overhead = 0
new-overhead = 0

old          = 10 (old-time - old-overhead)
new          = 6 (new-time - new-overhead)

All forms:
1.666667x as fast (old ÷ new)
0.666667x faster (old ÷ new - 1)
66.666667% faster ( (old ÷ new - 1) × 100 )
runs in 60% of the time it used to (new ÷ old × 100)
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