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#80
which one is fast depends on system specs.
keeping other specs unchanged with 2.0 GHz core2duo processor :
if total installed RAM size is 512 MB:
XP is faster than vista x86 & x64 all version.
If total installed RAM size is 1 GB:
Vista Home Basic x86 is faster than XP but here version of vista Home premium and ultimate are still slower than xp either 32 bits or 64 bits.
if total installed ram size is 2 gb:
vista x86 basic & HP is faster than xp but here still vista x86 ultimate and vista x64 all editions are slower than xp.
if total installed size of RAM is 4 GB.
vista x86 or x64 all editions are faster than xp.
if total installed ram size is 16 GB then the vista x64 bits with all editions are damn faster than xp.
so when you see any system running xp faster than vista then please look into the specification and I am sure that you find that particular system with low specs.