What are the ways of reducing load on routers?

Basically, the more antennas you have the faster your network can perform. Say you have 10 computers on your network with one router that only has one antenna. That one antenna is sending and receiving the requests for ten computers. when you incorporate additional routers, there are more antennas to manage the load from the ten computers. Also, if you set up a second wireless router as an access point in a different location than your primary router, you can double your wireless range.