Well, I have been reading all these benchmarks, and most of them seem flawed. I know at times, Vista can be slower, but personally I think, that it isn't all the time. There are things I like about Vista and things I don't. I did a personal benchmark with the same hardware, clean install, and used PC Mark 05 and 3D Mark 01. I ran all the test 3 times. All from a cold start, so there was no caching from a restart or what ever there might be. Just thought I would share my results and hopefully I don't get judged, that this is a flawed test. Everything thing is ran with the latest drivers and all set to default, no optimizing was done. So here is the test...

Test Setup (Tried to keep the hardware similar to what a typical person would use)
Pentium 4 (not dual core) 2.4Ghz
Intel p865 chipset
2GB DDR 400
80 Gig Maxtor HDD
Nvidia 7800 GS XP/Vista Driver 169.25
XP SP2 w/ current drivers and updates, and the same w/ Vista SP1 RC refresh

Startup time:
XP - 37 sec
Vista - 47 sec

3D Mark 2001:
XP - 9805
Vista - 11122

PC Mark 2005:
XP-3198
Vista - 2665

HDD XP startup: XP - 7.2MB/s   Vista - 7.18
Physics: XP - 98fps   Vista - 75.53
Transparent Windows: XP - 1040 windows/sec   Vista 474
3D: XP - 189fps   Vista - 180
Web Page Loading: XP - 1.82/s   Vista - .94
File Decryption: XP - 48.27Mb/s   Vista - 48.1
Graphics Memory: XP - 1352.59fps   Vista - 1165.21
HDD - General usage: XP - 5Mb/s   Vista - 4.97
Multi app test:
1 Audio: XP - 785.2kb/s   Vista - 739.8    
1 Video: XP - 106.14kb/s   Vista - 97.75
2 Text: XP - 46.5   Vista - 37
2 Image: XP - 9Mb/s   Vista - 8
3 File Compression: XP - 1.62/?   Vista - 1.43
3 File Encryption: XP - 13.3Mb/s   Vista - 12.14
3 Virus Scan: XP - 26.47Mb/s   Vista - 20.48
3 Latency: XP - 6.47   Vista - 6.35

These tests took a looong time to do. So hopefully someone finds them useful.