I am in the process of "Carbonizing" an OS 9 application. In the end, I really don't care how well it runs under OS 9, as it will only be run under OS X.
As with many apps, the app I'm porting devotes a fair amount of code to minimizing heap fragmentation. It would make Carbonizing somewhat easier if I simply whacked out a lot of that code. But I don't want to if I'm going to wind up with problems under OS X.
So: how big a problem is heap fragmentation under OS X?