So using WISP repeater to connect to my buildings guest network.
Using my TP-Link WR802n was getting around 10 Mb, using the Mango (3.022) was only getting around 1Mb (it would jump initially to 6-7Mb and then drop down to about 1Mb) via Speedtest. A huge difference!
Tried all sorts of things trying to work out what the difference might be.
Finally figured perhaps the IPV6 was the issue, the only major difference that I could see between the 2 units.
Network/Interface/LAN/Advanced Unclicked “Use builtin IPv6-management” and BAM, 10Mb!
Never had this much difference between the two units before and not sure what’s special about this network but worth keeping in mind for future reference if you get slow WISP repeater speeds.