I know how the qr stringifies, and that's exactly the problem.
However, when qr was introduced (which was long after perl5
as suggested elsewhere in this thread, I think it was 5.005)
it was suggested that qr would be faster when interpolating.
Even if you change the middle part of the benchmark to
$x = qq "$x"
and $x = qr "$x"
the qq is three times as fast as the qr.
I've had programs come to a grinding halt after using qr too
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