I just noted that threaded perls all came in much slower than unthreaded perls.
You sound surprised. I'd gather from your years on p5p that you would know.

For the rest of the world, it's a known fact that a perl build with thread support is significantly slower than a perl build without thread support (the ability to do threads is already enough for the slowdown - it's a price you pay regardless whether you actually use threads or not). This is why Perl by default (that is, after a ./Configure -d) is build without thread support.

In reply to Re^2: Why "Modern Perl" is slower than "Legacy Perl"? by JavaFan
in thread Why "Modern Perl" is slower than "Legacy Perl"? by dwalin

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