So, yesterday I bought two deco BE25 3600 and when connecting the second node through satelite I get very nice 1200+/1200+ speeds on the MAIN deco which is wired via Ethernet.

When the second node is ALSO wired via Ethernet, plugged into the same unmanaged Monkerlink 2.5Gig switch, or, via backhaul (plugged into eachtoher) my download speeds get cut in half, so on wifi i'd get 600/1200 on both nodes when wired by ethernet

I'd also like to  add whenever I get this weird bahaviour, Ultra speed mode becomes anavaible and says my device is not supported by it, but when second node is connected via satellite instead of ethernet, I get that same mode back to be avaible.

Topology:

ISP Router------------------------>OPNsense router---------------------->Manged Monker Link SFP+ switch----------------------->Unmanged 2.5Gig Ethernet and SFP+ Monker Link Switch
.                                                                                                                                                                                           |
IP: 192.168.1.1/23 (LAN)          IP:192.168.10.1/24 (LAN)              IP:192.168.10.2/24                                                     |____ Main deco (192.168.10.10) ip via opnsense-

.                                                Mask: 255.255.255.0                      Mask: 255.255.255.0                                                  |____Deco #2 (192.168.10.11) -dhcp lease on both decos
Mask: 255.255.254.0                IP:192.168.1.170/23 (WAN)

.                                                 Mask: 255.255.254.0