How to know the current refresh rate used by the host?

[Fewnity]

Hello! I'm using Moonlight for the PsVita, I noticed that when I set 60 fps mode on the client or a lower fps mode like 24, the network activity is still the same, the amount of data sent on the network to the client is not reduced (same if I set a lower screen resolution.) So is there a way to know if Sunshine is using the correct refresh rate and the screen resolution? Thanks!
(I analysed network packets with wireshark and the clients is sending the right refresh rate and resolution to the host.)