🚀 go-pugleaf

Hi!
Here are a few questions I would be interested in knowing the answers to,  
if somebody knows them:

How can you estimate the memory usage of an instance of an object in a  
program, beside using NXWriteObject and looking at the file size ? Is it  
the size of the declared instance variables plus method selectors, or are  
there some additional headers ? Are there any limits to the number of  
instances of objects and to the number of loaded classes in a program  
besides simple memory limitations ?

Is there any bottleneck in the run-time system when the number of  
instances/classes increases ?

I'm thinking of order of magnitudes like about 5000 instances of 500+  
classes/categories.

Thanks,

-Kjartan