Below are the aggregate routing throughput numbers for the TA 900e 3rd Gen:
Routing w/FW & NAT Enabled (IMIX Traffic) - 180mbps
Routing w/FW, NAT, QOS & Traffic Shaping Enabled (IMIX Traffic) - 100Mbps
Routing w/ VPN Enabled (IMIX Traffic) - 40Mbps
I went ahead and flagged the "Correct Answer" on this post to make it more visible and help other members of the community find solutions more easily.