Greyhole also uses Samba and it's logs to handle file operations.
After installing a wired gigabit network in my house, due to the WIFI being bogged down by 14 wireless clients, I tested the performance in the network. I got around 5500-600MBit/sec in read speeds and about 6600-700MBit/sec in write speeds. But when I tried against the Amahi server I found that I only got 56MBit/sec in read speeds.
After looking at the samba configuration file I saw that Async IO ('''AIO''') was not enabled by Amahi. What AIO does is that it let's Samba create multiple threads to handle file operations. This can, at the expense of some CPU cycles, increase the performance quite a lot.