the impact of encoding on performance.

Hi All

Snip <<<
 The drawback of using locales other than C or POSIX in PostgreSQL is
its performance impact. It slows character handling and prevents
ordinary indexes from being used by LIKE. For this reason use locales
only if you actually need them.
snip;

What is the impact of the locale  on the server ? is it irelevant, small
or huge ?

Encoding of the DB impact performance too ? UTF8, 8859-8 ?

Thanks

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