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Message: [QUOTE="Avi Bryant, post: 4465885"] Just posted on that... Only in truly pathological cases - for normal numbers of instance variables, the overhead of an external lookup table would be higher than that of keeping a few unused slots in the body of the object. But of course if the compiler saw that instances of a particular class might have up to 50 instance variables, it could choose to implement that class with a hashtable for variables. I'm not convinced that case is likely enough to be worth checking and optimizing for, but who knows. Avi [/QUOTE]