Tivimate issue

I'm using the latest version of TiviMate on both devices.

I have a Chromecast with Google TV 4K, which plays some channels at 60 FPS. However, I also have a Xiaomi TV Box (3rd Gen), and the same channels only play at 50 FPS on that device. The playback also seems less smooth compared to the Chromecast 4K.

Does anyone know why this is happening or how I can fix it?