I haven't tried to drive hard when cold either. But keep in mind, the temp display shows the 'normal' amount of bars by about ~123?F but the engine isn't actually warmed up until 185?F, and the oil temperature will lag behind that. (There is no oil temp sensor but that is always the case).
What I did notice is that the FiST takes forever to reach that warm up point - A solid 10-15 minutes of normal driving when it's below freezing, and that is with heater off. Chalk it up to being a modern engine with low internal resistance and synthetic oil I guess.