Well is you consider Moz's preferred RAM @ 28672 vs iCab's @ 3000 how could you not conclude Moz is a hog! <G>
Virtual Memory.
What you see isn't what you get. It's the apps *behavior* that determines how much real memory it holds.
When you launch an app, space for the full "preferred" size is made in the VM allocation table. And that's what you see in About This Macintosh. In tools such a Memory Mapper, you'll see that for Moz, more than 50% of that allocation doesn't exist in real memory yet[*]! And after using Moz for a while, with other apps being used also (vying for memory), that real allocation is actually reduced (unless you go hog wild like I do - creating a dozen+ tabs in each of 6 or so windows)!
Now let's look at iCab. It obtains a (relatively) tiny memory allocation at the initial launch. Then it does all its work in app & system temporary memory! IOW, it grows dynamically! Does this mean it's using less memory? Heck no! It's actually more piggy than Moz! It just grabs the memory out of a different basket (pool).
[*] No, this doesn't mean you're swapping either! The app is given the space in the VM map but nothing is associated with that space yet - neither real memory nor swap space. In the case of Moz, most of that will be paged-in directly from the shared libraries... Kindof a way of doing a delayed/partial launch.
FWIW, - Dan.
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