After initial installation I started to measure performance.
One really good tool for the job is windows experience index.
Initially my system had overall index of 2.1:
Then I checked for updates. Fortunately there were some from Microsoft. Here is the result after updates:
As you can see my index jumped to 2.3 and my graphics performance increased to from 2.7 to 3.0.
Encouraged by this I’ve installed latest video driver from NVIDIA (for Windows 7):
The results since positive My index increased to 2.4 were not so drastic, but still an improvement. Probably this is because my card is relatively old and slow or just because NVIDIA does not have(yet) drivers tuned specifically for Windows 8…
Only time will tell 😉