https://www.smarthomepoint.com/lutron-caseta-protocol-clear-connect/
I'm a big fan of Lutron Caseta smart switches and this article does a good job of explaining how their protocol is more robust and faster than others. I've noticed how fast it is to respond to commands sent from Home Assistant.
Lutron Caséta uses the Clear Connect RF communications protocol. This uses an entirely different frequency (434 MHz) from both Wi-Fi and 2.4 Gigahertz alternatives like ZigBee. The biggest reason for this change is to operate on a little-used frequency which gives users a better experience. Let’s take a closer look at why Lutron took the path less traveled.
