Can having 2 routers cause problems?
Having two routers will cause problems, like double NAT and wifi noise and interferences. It would be best to configure the 2nd MR in AP mode and set both MR units to using far appart channels on 2.4Ghz and 5Ghz.
Does having 2 modems affect internet speed?
Conclusion: Balancing Speed and Network Needs
In conclusion, while technically, having two routers in a network setup does introduce a minor increase in latency, this impact is measured in microseconds and is generally not noticeable in practical scenarios.
Does an extra router increase internet speed?
A router doesn't increase the speed of your internet connection. A 100Mbps plan remains as a 100Mbps plan, and there's nothing you can do or add to increase your speed outside upgrading to a faster plan. But a router can make or break the connections on your side of the modem or ONT.
Does connecting a router to a router reduce speed?
If the two routers are connected through cable the answer is almost no (you pay a little overhead). But you don't need another router, an access point (or a repeater) is a better choice. Will it decrease your speed? Yes.