I have to build wireless network in а big house. For this I have got four RB951G-2HnD routers ( it is enough for good coverage). The inbound ISP link comes to one of the routers. Other three routers are distributed around the house and therere no wired connections beetwen them and main router. I tried different types of setups (wds, mesh, repeaters, bridges) in order to get good working wireless network around the house. But each time I got very small internet speed and big ping on client devices. Is it normal or there are some methods to improove the situation? I cant provide wired connections beetwen routers.
You will need wires indeed. Are you aware of powerline ethernet adapters?
Yes, I think about it. But therere a lot of smart house electronic which are already using electric wires as a communication infrastructure and Im afraid powerline ehternet will not work.
Then get repeaters closer or run wires to them. Wires are always the best.