Looks like ntfs-3g has recently been getting a lot of optimization work:
STABLE Version 1.1004 (October 4, 2007)
change: file creation performance is improved by 40-80%.

change: smart directory traversal is 20-200% faster for disk based and 300-600% faster for memory cache based traversals.

Version 1.910-RC (September 10, 2007)

change: significantly improved the performance of writing many files, typically by 50-1000% (copying files, unpacking, untarring packages, compilation, directory synchronization, ...).

change: improved the performance of writing multi-GB size files, particularly after the creation of many thousands of other files.

change: improved concurrent write performance.