Basically that's correct. The ECM is a learning computer that adjusts timing, Intake cam timing, and fuel flow to compliment your driving style. The alogorithyms are set to provide you with a spirited ride when you romping on the pedal alot, but then pull everything back when you drive normal for better economy.
When I received my TRD reflash, I was instructed by TRD and the Dealership to give the install about 100 miles of normal driving before going hard on it. There seems to be alot of people angry that for all that money that got not much more in performance. Well, that was because the owners first impression was driving out of the Dealership. The ECM needs a number of inputs over a length of time to realign everything to the new alogorithyms.
I found this to be quite true.
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