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Slow macintosh memory allocation

I have a program that runs well for some time
and then gradually becomes slower and slower and slower.

I have tracked the problem down to the fact that
when it has becomed very slow, a single

(make-record :rgbcolor) (or any mac memory allocation)

takes almost half a second!

Strangely, at this point, a (ROOM) shows 145K of free
Mac Heap.

Any idea someone?
Thanks.

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