1.7] BUG - GREP slows to a crawl with large number of matches on a single file

[aputerguy]

Changing LC_ALL also solved the problem for me.
But it begs the question of how many other basic and take-for-granted
functions might be affected by this apparent UTF-8 slowdown. And again we,
are not talking about some minor overhead, we are talking about a slowdown
of 1500X or 150,000%!!!!

As a North American English speaker, UTF-8 is not that important to me and
certainly not worth such a heavy overhead price.

Also, while I don't have 'pcgrep' installed on my machine, it is interesting
that 'sed' is not affected.
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