Small suggestion..I would get rid of both the map{} and the grep{}. Both of these things use anon lists and at the end of day, some @anon_list gets pushed onto @lines. A simple loop that doesn't use these constructs should be faster. 
while (<$fh>)
{
   if (/Running|Dump|FromCB|Update/o)
   {
      push ( @lines, filterLog($_) );
   }
}

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Update: 
push @lines, grep { /Running|Dump|FromCB|Update/o && filterLog($_) } <
+$fh>;

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Is a good idea, but don't think that it works. @lines needs to get the output of filterLog(). Grep is just a simple "filter", so this would need to be a map{} otherwise looks like you always get the value of <$fh> when the value of the grep statement is "true"?

In reply to Re^2: How to improve speed of reading big files by Marshall
in thread How to improve speed of reading big files by korlaz

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