I don't know, at this point it might be necessary. Aperture is probably the least efficient application I've ever used.
It takes a crazy amount of RAM to keep Aperture happy; even though Aperture isn't using it all, if I try to run only 6 or 8 GB of RAM, the whole program becomes sluggish.
Another mac user that has something wrong.. i run aperture on my macbook pro 8GB ram and it runs perfectly.. in all manners.. even when i have a virtual machine still running.. do you have a load of plugins etc.?
In all fairness it got sluggish at 4GB ram but with 8GB i can run anything i like on my laptop and A3 is very responsive at all times...
I do agree that improvements should be made in speed though...