Deco XE75 wired ethernet backhaul extremely slow upload speed
I have a mesh wifi system composed of 2 Deco XE75 and 3 Deco X60. The main Deco is an XE75, the other XE75 is connected by ethernet to the first one and the 3 Deco X60 are using the wireless backhaul.
When connecting to the 2nd Deco XE75 I get fast download speeds close to 1 Gbps as expected, but the upload speed is very slow, like 1 Mbps.
When disconnecting the ethernet cable from the 2nd Deco, and it uses the wireless backhaul I get upload speeds of a few hundred Mbps.
The ethernet link between the two Deco XE75 devices is a 2.5 Gbps link running through a MoCA 2.5 network (using goCoax MA2500D adapters).
I have tested manually the ethernet link and it has about 2 Gbps download and 2 Gbps upload speeds. It supports 2500/1000/100 Mbps link speeds and I've tested it using a 2.5 Gbps device.
Any ideea why does Deco XE75 perform so poorly in terms of upload speed when connected by ethernet backhaul?