Transmission issue?

[Twistoffate0817]

Originally Posted by yaris-me

The Yaris engine and transmission is controlled by a computer, ECU. The ECU controls the warm-up from a cold start. The up-shift is delayed and will not up-shift to 4th until the engine is warmed, 2 to 5 miles. The ECU is adaptive and will adapt to your driving style. If you drive slow then switch to spirited driving the car will seem very sluggish until the ECU starts to adapt to the new driving behavior. There are a lot of threads on this type of complaint with new Yaris owners.

This might be the case for me, but I do not want to get my hopes up. For most of the time I do go very easy on my yaris, and then once in a while i push it. If this is a case of my cars ECU being used to my driving style, then how can it explain my feeling of heavy-ness even when i am driving my normal slow way?