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Here's a performance test of Levenshtein vs Sift4 using UTF-8 strings for anyone interested:

if only i could see the results.

You click the "run tests" button. Results are in "Ops/sec". I get

Levenshtein (Wiki): 33.11 ± 0.83%

Levenshtein (php.js): 28.01 ± 0.43%

sift4: 1620 ± 1.26%

Levenshtein (fast-levenshtein): 37.58 ± 3.61%