Despite "75mbps" upload, any individual TCP connection seems to be limited or throttled to around 10Mbps.
This impacts most file upload activities, as most transfers utilize only a single connection.
To hit 50+Mbps, it would require >5 individual connections.
Tests are performed using iperf to Leaseweb's public iperf server in Seattle.
https://kb.leaseweb.com/kb/network/network-link-speeds/
Ookla's Speedtest removed the option to perform speedtests with a single connection, so there is currently no way to perform the test within GCI infra anymore. Ookla's speedtest will make connections to multiple servers then aggregate the throughput from every connection to provide results.
eg, this provides unrealistic results for any data stream that only utilizes a single TCP connection.
Test is performed every hour at the top of the hour.
The scatter plot points are the highs and lows which are not maintained. The highs are generally the burst that is provided upon the start of the test.
Running iperf in reverse mode I am able to download at over 400Mbit/s consistently, with some test sustaining over 1Gbps. I don't think the slow single-threaded upload throughput can be blamed on the route or remote server/infrastructure.
frozenak@netmon:~/iperf3Vis$ iperf3 -c speedtest.sea11.us.leaseweb.net -p 5201 -R
Connecting to host speedtest.sea11.us.leaseweb.net, port 5201
Reverse mode, remote host speedtest.sea11.us.leaseweb.net is sending
[ 5] local 192.168.1.101 port 50414 connected to 23.82.193.66 port 5201
[ ID] Interval Transfer Bitrate
[ 5] 0.00-1.00 sec 27.1 MBytes 227 Mbits/sec
[ 5] 1.00-2.00 sec 53.0 MBytes 445 Mbits/sec
[ 5] 2.00-3.00 sec 54.9 MBytes 460 Mbits/sec
[ 5] 3.00-4.00 sec 56.2 MBytes 472 Mbits/sec
[ 5] 4.00-5.00 sec 56.9 MBytes 477 Mbits/sec
[ 5] 5.00-6.00 sec 56.2 MBytes 472 Mbits/sec
[ 5] 6.00-7.00 sec 53.9 MBytes 452 Mbits/sec
[ 5] 7.00-8.00 sec 55.9 MBytes 469 Mbits/sec
[ 5] 8.00-9.00 sec 54.8 MBytes 459 Mbits/sec
[ 5] 9.00-10.00 sec 51.5 MBytes 432 Mbits/sec
- - - - - - - - - - - - - - - - - - - - - - - - -
[ ID] Interval Transfer Bitrate Retr
[ 5] 0.00-10.08 sec 548 MBytes 456 Mbits/sec 30 sender
[ 5] 0.00-10.00 sec 520 MBytes 436 Mbits/sec receiver