We just upgraded our internet to 940/940 Mbps and installed a CRS326-24S+2Q+RM with it.
The whole office is wired in cat6a, and computers has 10Gbps NICs.
Doing iperf between a computer and our data depot results in 3.2/3.2 Gbps.
Doing any speed test with the internet results in 320/320 Mbps.
The router reports the port to internet is a duplex 1Gpbs.
The router reports others ports - to computers and our depots - to be 10Gbps. (The depot will soon be hooked in 40Gbps)
Why is the router making all our speed divided by 3?