RB1100ahx2 connected with cable lan asymetric performance.

Hardware MikroTik hardware general
1

Hi all,
I have connected
Rb1100ahx2 —directly cable(100-fullduplex) — AP(rb433ah)> PTP wireless -< - STATION(rb433ah)

This is problem:
When test with bandwidth-test from station to ap is:

  1. tcp/send 80Mbps
  2. tcp/reive 80Mbps
    when instead test from station to rb1100ahx2
    1)tcp/send 80Mbps
    2)tcp/recive 15/20MBPS

I tried test from rb1100 to Ap, (remember is connected to cable lan 100mbpsfullduples)
is:
1)tcp/send 60/mbps
2)tcp/recive 100/mbps

All routerboar with firmare 5.24

why?