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Result of bench.py attached to issue #25267: attached bench_utf8_result.txt.
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Summary                        | utf8_before |   utf8_after
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ignore: "\udcff" * length               | 7.63 us (*) |    7.91 us
ignore: "a" * length + "\udcff"            | 10.7 us (*) |    10.8 us
ignore: ("a" * 99 + "\udcff" * 99) * length      | 2.17 ms (*) |    2.16 ms
ignore: ("\udcff" * 99 + "a") * length        | 843 us (*) |     866 us
ignore: "\udcff" + "a" * length            | 10.7 us (*) |     11 us
replace: "\udcff" * length              | 7.87 us (*) | 8.43 us (+7%)
replace: "a" * length + "\udcff"           | 10.8 us (*) |    10.9 us
replace: ("a" * 99 + "\udcff" * 99) * length     | 2.46 ms (*) |    2.46 ms
replace: ("\udcff" * 99 + "a") * length        | 907 us (*) |     939 us
replace: "\udcff" + "a" * length           | 10.9 us (*) |     11 us
surrogateescape: "\udcff" * length          | 14.2 us (*) | 17.2 us (+21%)
surrogateescape: "a" * length + "\udcff"       | 10.6 us (*) |    10.7 us
surrogateescape: ("a" * 99 + "\udcff" * 99) * length | 3.19 ms (*) |  3.4 ms (+7%)
surrogateescape: ("\udcff" * 99 + "a") * length    | 1.64 ms (*) | 1.87 ms (+13%)
surrogateescape: "\udcff" + "a" * length       | 10.6 us (*) |    10.7 us
surrogatepass: "\udcff" * length           | 23.1 us (*) |    23.5 us
surrogatepass: "a" * length + "\udcff"        | 10.7 us (*) |    10.8 us
surrogatepass: ("a" * 99 + "\udcff" * 99) * length  | 4.39 ms (*) |    4.44 ms
surrogatepass: ("\udcff" * 99 + "a") * length     | 2.43 ms (*) |    2.47 ms
surrogatepass: "\udcff" + "a" * length        | 10.6 us (*) |    10.8 us
backslashreplace: "\udcff" * length          | 65.7 us (*) |    64.3 us
backslashreplace: "a" * length + "\udcff"       | 15.7 us (*) |     15 us
backslashreplace: ("a" * 99 + "\udcff" * 99) * length |  12 ms (*) | 15.9 ms (+32%)
backslashreplace: ("\udcff" * 99 + "a") * length   | 11.1 ms (*) | 13.5 ms (+22%)
backslashreplace: "\udcff" + "a" * length       | 16.4 us (*) | 15.1 us (-8%)
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Total                         | 41.4 ms (*) | 48.3 ms (+17%)
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