@jcolley    At this point, I strongly recommend you to use "iPerf3" to measure the WAN performance.   download it from here https://iperf.fr/iperf-download.php       You will need to install the app on both ends.   a) Hub : run iperf3 -s b) Spoke: iperf3 -c  1.1.1.1 -f M -P 4  (your Server IP on Hub Site,format of Mbits, 4 concurrent connections)   https://documentation.meraki.com/zGeneral_Administration/Tools_and_Troubleshooting/Troubleshooting_Client_Speed_using_iPerf           You want to change the windows size to improve the throughput.        ... View more