It's just me on the LAN, so I'm not consuming the device's available bandwidth.

my 10 GBE SFP interfaces are Xi0 and Xi1

when not using failover LAG configuration, I get 2 GBE down, 350 up on the internet which is what I pay for.
when I put Xi0 and Xi1 into a failover lag, making Xi0 the primary interface, I get sub 200MB down and sub 100 UP.

Xi0 is connected to a Unifi USW Aggregation(A)
Xi0 is connected to a different USW Aggregation(B)
the USW Aggregation's are connected to one another
I'm connected via a Unifi USW Enterprise 8 PoE which has runs to both USW Aggregation(s).

I'm running version 24.11