[Zope] Slow File Access With LocalFS

Hello. I'm using LocalFS to reference a large collection of mp3 files. (I figured it was probably a good idea not to upload the whole shebang to the ZODB, so I just added a LocalFS object to reference the top directory of the collection.) When I try to download a file by calling the Zope object (for instance, http://zopeserver/LocalFSObject/mp3file.mp3) it takes 30 seconds for the average mp3 file to start streaming. Other files, i.e., way smaller ones, like 4K playlist files, download very quickly. Is Zope or LocalFS choking on the large files? Is there some work-around I'm missing?