I have multiple Roku devices. One is in the kitchen and the other in a nearby room. Each by itself is fine however they are seriously out of sync with each other. When you can hear both from the different rooms it drives us crazy.
What is the reason for the delay. They are both on the same wifi. Is it the type of device, they are different.
There can be multiple reasons. The most likely is that one is using a bigger buffer, causing more of a delay. Also, different models may have different hardware with different delays on processing the data.