I've updated the original post to have profile data between a good run and bad run - maybe that will help.

Hm. That tells us that the vast majority of the time (98%+) in the slow version is spent in Compress::Raw::Zlib::inflateStream::inflate

Which doesn't make a whole lot of sense given that they are inflating the same data from the same place in both cases.

A line profile might shed more light; but it seems doubtful given the time is spent doing what is effectively input; but the difference in the code is the output target.

Again, I urge you to obtain the page fault stats.

With the rise and rise of 'Social' network sites: 'Computers are making people easier to use everyday'
Examine what is said, not who speaks -- Silence betokens consent -- Love the truth but pardon error.
"Science is about questioning the status quo. Questioning authority".
In the absence of evidence, opinion is indistinguishable from prejudice.

In reply to Re^5: IO::Uncompress::Gunzip to scalar takes hours (on windows) by BrowserUk
in thread IO::Uncompress::Gunzip to scalar takes hours (on windows) by cmv

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