Firstly apologies to the OP a high-jack of your thread was not intended, but you get help where you can.
Hi Colin
Many thanks for the interest here is what I know, (Which is probably not enough)
From Saffire control panel Saffire Pro control Version 2.6
Saffire Pro 26i/o firmware version 2.1.8386
ASIO Panel settings ASIO buffer size 5.0 ms
Firewire buffer size 2.5 ms
Input Latency 6.6 ms
Output Latency 11.5 ms