Operating on unicode is of course always slower. But only non-ascii strings are stored upgraded by use utf8. So the performance impact is necessary to get the correct length of such strings. (It's also cached in MG_LEN after the first access.)
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Also, does
use utf8slow Perl down by storing strings internally as upgraded?To get the
length()of an upgraded string, Perl has to parse the individual characters. But thelength()of a downgraded string is just its SvCUR.Operating on unicode is of course always slower. But only non-ascii strings are stored upgraded by
use utf8. So the performance impact is necessary to get the correct length of such strings. (It's also cached in MG_LEN after the first access.)