Finally, SP1 is released. I heard this SP improve (or just normalize) the Vista performance.
You may read the review here.
and download the SP1 file from Miscrosoft.
Warning: This file is 434M in size and required around 5-6G of hard disk space for installation.
Like most of the user, I owned a copy of Vista but I had surrender with this sohai OS. Hope this SP will really bring Vista back to normal.