Yes, thats why I called it badly optimised.
Decision to make something playable on pcs 10 years after release is very bad. Why should MS do it when it releases new versions every 3-5 years after release? I do not know what MS was thinking about in the 2006.
Yes, they thought we will have 20Ghz processors now, but we have only 3,5Ghz max. I hope MS will learn from their mistakes and do it playable on high end machines now, not five-ten years later. If they will think this way in the future, people will be angry, because nothing they release will work smoothly and properly... :(
For example why should they release "Windows 12" now, when it could not be run on today high-end pcs? Noone would like to buy it. Why should I play the FSX in 2017 when Flight will be seven years on the market? Why should I play Flight in 2025 when Flight II released eight years ago? I do not think it is good decision to make it this way...

As I said - hope they will learn from it, because they cannot know what type of machines we will have in 2015...