You seem to be using pretty structured data (maybe the wrong word here, sorry), yet only one of your regexps is anchored. If you know the position of certain strings (especially /Running|Dump|FromCB|Update/o), you could gain some speedup by anchoring, even if you have to resort to assigning to pos.

Another thing would be to precompile or use the /o modifier on your substitutions, since &filterLog gets called so often.

print pack("A25",pack("V*",map{1919242272+$_}(34481450,-49737472,6228,0,-285028276,6979,-1380265972)))

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

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