Add new note on USB 3.0

Author: nguyenquyhy

docs/USERGUIDE.md

@@ -157,3 +157,4 @@ Go show MobiFlight some love over in their [forum post](https://forums.flightsim
 - If you spam the same buttons too quickly, SimConnect will get error and stop responding to any further command. The plugin will try to automatically reconnect. 
   - However, if you see the message "Connected to Flight Simulator" flashing constantly in the sim, the plugin might be in a infinitely retry loop. In this case, close Stream Deck software on your PC (which will kill the plugin), wait a couple of seconds for all the SimConnect connections to close, and re-open Stream Deck.
 - When you setup new generic buttons or COM/NAV button, the registration between the plugin and SimConnect might get messed up and the plugin stops receiving data. In this case, you'll need to restart Stream Deck software.
+- If your gauge looks delayed or the dial feels laggy (take a few seconds to register the change), you have most likely plugged the Stream Deck into a USB 2.0 port or some slow speed hub. Make sure the connection between the Stream Deck and the PC is USB 3.0 or higher.