Although mesh networks can be very useful, they usually can’t provide the speeds or throughput that a traditional wireless network can. When a mesh node connects wirelessly to another node, the throughput can be cut in half. This happens for each wireless hop, so making two hops could cut throughput down to about a ¼…

it depends on the brand of the old router—some have a repeater function built into their OS, other require tomato/dd-wrt to support it

Is it possible to use an old wifi router as a repeater to my new wifi router? Could I just link em with cat6 cable?