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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?

* Guillaume Cartier                 (514) 844-5294 (maison)         *
* L.A.C.I.M.                        (514) 987-4290 (bureau)         *
* Universite du Quebec a Montreal   (514) 987-8477 (telecopieur)    *
* Montreal, Quebec, Canada          cartier@math.uqam.ca (internet) *