You can further exacerbate the costs, by using one of the many 'safe' object implementations that add another level or two of indirection to the object and method resolution chains. All the 'inside out object' implementations fall into this category.
I don't think the latter claim is quite correct. In fact, it appears that the handling of Object::InsideOut objects can be faster than legacy blessed hash handling. Cheers.

In reply to Re^2: Performance issues with subroutines/methods by fenLisesi
in thread Performance issues with subroutines/methods by ribasushi

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