AR300M dumb AP issue

I swear I have already done this but here goes attempt 49 or so.

Hard reset the device (hold reset for >10 seconds).
Open up Network -> Interfaces. Select "edit" under "LAN".
Set IP = 192.168.123.250, mask = 255.255.255.0
Disable IPV6 assignment length.
Disable DHCP.
Disable Router Advertisement Service
Disable DHCPV6 Service
Disable "use builtin IPV6 management"
Save & Apply.
Set wireless adapter on PC to 192.168.123.251, mask = 255.255.255.0
Reconnect to AR300M. Confirm all previous settings. System -> Reboot.
Reconnect, log back in and confirm settings.
Plug ethernet cable into LAN port. Ping AR300M. Get reply for the first time! Ping the hard-wired network device.
Reply = 2147ms
Reply = 13ms
Reply = 8ms
Reply = 524ms
Perform another ping and get an average of 10ms.
Next PING I get 42ms, 878ms, 2386ms, 6ms.
Try PINGing the AR300M. Average = 5ms.
Plug ethernet cord directly into PC. Perform another PING on the network device utilizing hard-wire.
Average = 1ms

What is the deal?

802.11 is slower than 802.3.

802.11 is always half-duplex. 802.3 can be, but isn't always.

802.11 is frequently affected by RF interference more than 802.3 is.

Take your pick. There are other possible causes as well.

But the important thing is that you're getting replies from the equipment, where you weren't before.

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If wireless were the problem wouldn't I be getting crazy delays when pinging the AR300M? Long ping times are only when I'm talking through the AR300M to the other network.

So I'm fast from my computer to the AR300M through wifi. I'm fast to the device on the network when using hard-wire. Some other issue seems to be the only explanation for why I'm slow when going through the AR300M.

Just to give everyone an update - I never got this to work properly at this site. I called the last technician to work at the facility and they had the exact same problem with their dumb AP that they use regularly at other sites. It just wouldn't work.

So it seems to have been something on this particular network interfering.