[lime-users] Generell Speed-Performance question / Issue

I have a test-network running with a bunch of ac/an Adapters. I got connections up to 866MBits between the adapters (5Ghz mesh) but even with this fast connection I only got 40Mbit up/down Speed in direction to the internet. Only on the one Adapter connected directly to the Internet i got the full speed (250/40). I also played around with distance parameters with no measurable impact. Are there other possibilities to speed up the mesh? Thanks in advance, Andy