Many publish tests that talk about the speed of the seven, that it is faster whists. If you think about it, then many explanations will come to your mind that it is faster than whists. For example, the fact that Microsoft has optimized the drivers, and the code. But if you dig a little, it will become obvious that the main performance benefit of win7 is that now it does not use the paging file until the RAM runs out .
Before that, I had to disable the paging file so that everything would fly, but sometimes, even with 4 gigabytes of RAM, resources were not enough. Now this is not necessary.
Of course, most likely there were still many optimizations in wines 7, but this, in my opinion, is the most obvious and necessary.