bug#18522: 24.4.50; mapcar is very slow

[Lars Ingebrigtsen]

Peter Münster <pmlists@free.fr> writes:

> Thanks. But it does not explain, why it's much faster after restarting
> emacs. Please find attached 2 recent profiler reports for comparison.

It's kinda puzzling.

Could you `M-x debug-on-entry RET gnus-sort-threads RET' and then save
the value of the `threads' variable when this is slow and when this is
fast.

And then either compare the values to see whether they're really the
same, or post them here for inspection...

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