How many MESH nodes in local network

I am wonder haw many nodes you have in local networks ? and how many hops ?

I am asking about this because we have see that in Mesh network bandwidth changing with follwoing

    1 hop - 50% of the possible bandwidth.
    2 hops - 25% of the possible bandwidth.
    3 hops - <10% of the possible bandwidth.
    4 or more hops - it stabilizes at 7% of the available bandwidth.

How to solve problem bandwidth with many nodes in local network  ?