>but shouldn't the pre-compiled regex run faster

Not necessarily From perlop

Since Perl may compile the pattern at the moment of execution of qr() operator, using qr() may have speed advantages in some situations,...

And not any more as often as it used to be!

...Perl has many other internal optimizations, ...

(emphasizes added)

UPDATE: Furthermore in both your code examples the regexes are just compiled and used once.

Cheers Rolf

In reply to Re^3: Problem with pre-compiled regex by LanX
in thread Problem with pre-compiled regex by saranrsm

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