NTFS is slow, especially when you operate on a lot of tiny files (nobody in the Windows world would do that, you'd always put your tiny data blobs into a bigger container file, e.g. asset files in games), but from my corporate experience, it's mostly the _multiple_ "endpoint security" solutions that bog file system performance down.

It's the reason I so far use a Mac at work, which has its own issues, and a lot of them.