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.
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