hfs IS the problem.
The problem is less clear on LAN connections but the HFS (http) speed is still slower than for example an FTP transfer over your LAN.
In my case: The same file, transfered with HFS: 2,23MB/s, transfered with Filezilla: 2,7MB/s
On a WAN connection, the situation is much worse.
I have an upload limit of 450KB/s but my upload speed with a single file transfer with HFS varies between 15KB/s and 200KB/s !!!!
Screenshot of a transfer on a dedicated 450KB/s upload line:
UpdateWith the normal 2.2 version, the speed is very limited but stable (on LAN and on WAN connections)
+- stable 40% of max possible speed.
With 2.2 speed edition, the speed is less limited but very unstable.
+- variable speed between 5% and 70% of max possible speed.