@Drrmqjones 

Could be the switch issue.

If you have two computers, you can use Iperf to test the switch hardware performance:

How to use Iperf to test the speed of TP-Link switches

  @Somnus I finally got the chance to do an iperf test, and these are my results:

C:\Users\rjones>iperf3 -c 192.168.86.50
Connecting to host 192.168.86.50, port 5201
[  4] local 192.168.86.40 port 60906 connected to 192.168.86.50 port 5201
[ ID] Interval           Transfer     Bandwidth
[  4]   0.00-1.00   sec  79.4 MBytes   666 Mbits/sec
[  4]   1.00-2.00   sec  85.1 MBytes   713 Mbits/sec
[  4]   2.00-3.00   sec  80.9 MBytes   679 Mbits/sec
[  4]   3.00-4.00   sec  80.9 MBytes   678 Mbits/sec
[  4]   4.00-5.00   sec  81.8 MBytes   686 Mbits/sec
[  4]   5.00-6.00   sec  86.8 MBytes   728 Mbits/sec
[  4]   6.00-7.00   sec  88.8 MBytes   744 Mbits/sec
[  4]   7.00-8.00   sec  83.2 MBytes   699 Mbits/sec
[  4]   8.00-9.00   sec  79.1 MBytes   664 Mbits/sec
[  4]   9.00-10.00  sec  77.0 MBytes   646 Mbits/sec
- - - - - - - - - - - - - - - - - - - - - - - - -
[ ID] Interval           Transfer     Bandwidth
[  4]   0.00-10.00  sec   823 MBytes   690 Mbits/sec                  sender
[  4]   0.00-10.00  sec   823 MBytes   690 Mbits/sec                  receiver

iperf Done.
 

Shouldn't these be closer to 1000 Mbits/sec?

  @Drrmqjones 

Yep, it should be around 1000Mbps so this switch's performance is not good.

  @Somnus after chatting with customer support for about 45 minutes, with them repeatedly telling me to try things I had already tried, asking me for my (irrelevant) ISP speed, etc., I finally convinced them (after telling them 4 times) that I had already done the iperf test and what the results were.  They told me to return the switch for a new one, so that's what I'm doing.