tlw
Apple use intel hardware but OS X doesn't have the wifi dpc latency problem at all and never has. I'm tempted to use bootcamp to put Windows on one of our Macs just to see if the problem is there when Windows is running on Apple hardware and using Apple-supplied drivers.

It's nothing at all to do with the hardware, both Apple and PC use the more or less the same hardware architecture nowadays. It's the OS itself and/or the driver.

With Windows I don't have issues with WIFI (although rarely use it), that's probably down to my hardware and drivers, however I see Linux (unsurprisingly) performs much better when it comes to latency.
 
You will get much better results using an ethernet cable btw. Ta.

tlw

SMcNamara
On a related point, I have a USB wifi adapter that I would plug in, update and then "disconnect" from the System Tray icon.  Then unplug the USB adapter.  I sense I could go into the Device Manager, right-click and disable a USB port that the adapter sits in but how do I know which USB item in Device Manager would be correct?

In Device Manager you don't need to disable the USB port. The network adaptor will have an entry of its own and that's the one to disable. Simply unplugging it won't necessarily result in the driver being unloaded or stop it trying to poll the (missing) interface.

TLW:  Thanks for responding.  I don't just unplug the USB wifi adapter, I first "disconnect" in Windows, the light on the USB adapter goes dark and I then unplug it.  Maybe that doesn't make a difference.  Based on comments here I might just leave it in since I have a good firewall, good anti-virus software, etc.  But thanks for the help.

I am wireless connected to my Internet for updates only and just pull out my Usb stick to disconnect.
Use Anti-Virus and Malwarebytes to check on things.
 
Windows 10 going great ,no problems.
 
All the best
John

SMcNamara
TLW:  Thanks for responding.  I don't just unplug the USB wifi adapter, I first "disconnect" in Windows, the light on the USB adapter goes dark and I then unplug it.  Maybe that doesn't make a difference. 

It doesn't. If you had a USB stick with storage, or a hard drive plugged in the USB port then that would be the appropriate method to avoid data loss. There's no really important data loss via a USB wifi adapter... And of course Windows will unload the device.
 
Cheers...