my diagnosis is perhaps incorrectly based on noticing about 4-5 seconds per minute improvement running the same batch with a 1 megabyte buffer with that loop I posted against the default file handle method.
I'm generally trying to move most of the operation into memory, as the process itself consists of 300 lines of regex match statements for looping through plain text and/or html files.
as for profiling the code, i'm still very much of a novice and am only now branching into code optimisation. if you've got some pointers there it would be greatly appreciated :)
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