Hello,
Test was carried out for clarify the performance characteristics of the Cisco 1921 router with different configurations during transmission of packets with different length.
Cisco 1921 showed amazing performance.
If router works only as gateway between subnets without services, it can forward 400Mbps random packets with 60-70% CPU utilization.
You can see the attached file if you are interested.
Test for Cisco 892 router you can see here:
https://supportforums.cisco.com/document/12305591/cisco-892-router-performance-test
--
Juri