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"It's talking about optimizing something that takes less than 1% of the vast majority of an application's cycles."

What takes the other 99%? Did you measure?

Yes.

At least in my own apps. Model instantiation being a bottle neck practically implies that you generate models in a tight loop and do nothing else with them, such as persisting them.

But, people do precisely that. I was working with parsing log files and converting each row to a Mongoid object took forever. It was in a tight loop and did nothing but persist it. So, I had to drop into the Ruby Mongo driver, avoiding the ORM altogether.

So, what took the other 99% if not model instantiation?

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