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runewidth.StringWidth is an expensive call, even if the input string is pure ASCII. Improve this by providing a wrapper that short-circuits the call to len if the input is ASCII. Benchmark results show that for non-ASCII strings it makes no noticable difference, but for ASCII strings it provides a more than 200x speedup. BenchmarkStringWidthAsciiOriginal-10 718135 1637 ns/op BenchmarkStringWidthAsciiOptimized-10 159197538 7.545 ns/op BenchmarkStringWidthNonAsciiOriginal-10 486290 2391 ns/op BenchmarkStringWidthNonAsciiOptimized-10 502286 2383 ns/op