> the bottleneck is that NTFS is a crappy filesystem.
Care to explain why do you think NTFS is crap?
From my experience it's usually bad assumptions about files under windows and every application or library tries to stick to posix interface when dealing with files (open, read/write, close) which tends to block for longer periods on windows than on linux counterparts which results in significant perfomance loss .
Linux first software will always outperform windows implementation and Windows first software will outperform Linux implementations unless you provide separate code paths to properly handle underlying OS architecture and assumptions.
On Windows closing the file handle is extremely costly operation due AV checks and file content indexing [1]