WiFi so slow that it was unusable.
Found this fix on-line and it worked.
From /lib/firmware/ath10k/QCA9377/hw1.0 directory:
Copy firmware-6.bin somewhere in case you need it at a later date.
DELETE firmware-6.bin from above directory.
Reboot, Setup > Network Connection Wizard.
WiFi will now be much faster and usable.
I have no idea why it works.