While running the factory installed firmware 8.0.1 build 1032, the Balance 20X is usually hitting its advertised throughput of 900Mbps. When running the available update firmware 8.0.2 build 1045, WAN to LAN throughput appears to be lowered by about 300Mbps.
I haven’t tested this in perfect lab conditions, but have switched between the two firmware versions several times with consistent results.
I purchased the 20X to replace a Balance One only because its 900Mbps throughput on the 20X can take better advantage of the 1Gbps internet connection. With firmware 8.0.2, the 20X is performing the same or worse than the Balance One at about 550Mbps.
Is this a known issue? If firmware 8.0.2 or future versions will lower throughput on the 20X, I need to know now so I can return it.