Ubiquiti UniFi AP AC Pro : byte rate issue from LAN

Hello everybody

I want to share with you a issue that i have with my Ubiquiti UniFi AP AC Pro.
I have install the last OpenWRT relaese "19.07.6" all seams to work well, BUT
When I try to download a test file (1Go) with the LAN interface, my rate transfert is near 24Mo/sec
curl --output /dev/null http://ipv4.bouygues.testdebit.info/1G.iso
With another appliance (not OpenWRT but opnsense) If I realise the same request (with the same cable) I canreach 100Mo

Here there are some information

eth0      Link encap:Ethernet  HWaddr XX:XX:XX:XX:XX:XX  
          inet addr:  Bcast:  Mask:
          inet6 addr: fe80::1ae8:29ff:fe08:671c/64 Scope:Link
          RX packets:1384091 errors:0 dropped:**12522** overruns:**5** frame:0
          TX packets:430524 errors:0 dropped:0 overruns:0 carrier:0
          collisions:0 txqueuelen:1000 
          RX bytes:1976355156 (1.8 GiB)  TX bytes:48297446 (46.0 MiB)

root@OpenWrtUnifi:~# swconfig list
Found: switch0 - mdio-bus.0

root@OpenWrtUnifi:~# ethtool eth0
Settings for eth0:
	Supported ports: [ ]
	Supported link modes:   1000baseT/Full 
	Supported pause frame use: No
	Supports auto-negotiation: No
	Supported FEC modes: Not reported
	Advertised link modes:  1000baseT/Full 
	Advertised pause frame use: No
	Advertised auto-negotiation: No
	Advertised FEC modes: Not reported
	Speed: **1000Mb/s**
	Duplex: **Full**
	Port: MII
	Transceiver: internal
	Auto-negotiation: on
	Current message level: 0x000000ff (255)
			       drv probe link timer ifdown ifup rx_err tx_err
	Link detected: **yes**

Did someone has the sale issue ?
Who could help me ?

Thanks a lot.