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Pixelmator relies on Core Image, an OS X technology that underpins numerous applications, notably Apple's Aperture. While trying to fix a memory leak, Pixelmator's developers discovered that the application was not to blame; the problem lay with Core Image.

"Some Pixelmator users have encountered a not so tiny memory leak that dramatically slows down the application, but this is not the worst thing," developer Saulius Dailide wrote in a blog posting. "The really bad thing is what we found after we spent a lot of time trying to find and fix it. At first we thought this was a Pixelmator problem, but sadly this problem is not in Pixelmator; it is hiding deep in Core Image itself and probably affects not only Pixelmator, but also other apps that take advantage of Core Image."

Apple is aware of the problem and working with Pixelmator Team to fix it.