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Slow apparition of the Open Dialog, solution?

I'm observing a very slow apparition of the Open Dialog for a Cocoa document application. While this dialog is displayed relatively fast for applications such as TextEdit, Safari or SubEthaEdit, in my case, the dialog is slow to appear with this application (add 3 seconds at least to the time it takes TextEdit to show the Open Dialog).

Since this is the AppKit which is dealing with the task of showing the Open Dialog through the NSDocument stuff, I don't think the problem comes from my code.

Is there anything that can be done with the "Document Types" settings in the Info.plist file to speed things up? I didn't set a MIME Types, could this help to add one? Could this be because the application is built with gcc 3 and the 10.2.8 SDK?

For the record, the difference is less noticeable on a G4 400 MP with Mac OS X 10.2.8 than on a G4 Quad with Mac OS X 10.4.7.

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