Microsoft has been promoting Vista’s SP1 as a big performance booster compared to pre-SP1 Vista, particularly when copying files. But my preliminary tests show that Vista SP1 can be as much as 20% slower than pre-SP1 when it comes to copying files. And XP’s copying speed leaves both in the dust.
I found that copying a large file — 2.49 GB — to a local folder under SP1 Vista was 20% slower than performing the same operation in pre-SP1 Vista. Copying that same file to a network folder took essentially the same amount of time in pre-SP1 and SP1 Vista. And copying a 256 MB folder full of files to a local disk and to a network folder took essentially the same amount of time in each as well.
Full Article – http://blogs.computerworld.com/vista_sp1_slow
