If you are getting low internet speed on Jio stb, it might be because of bad connection mode between Jio stb and Jio Fiber modem/router. To fix this, ensure you are connected to 5GHz wifi (ac) band of JioFiber router and the wifi signal is of good strength or via >=CAT 5e ethernet cable. I have seen users connect to JioFiber router via 2.4GHz wifi band and face speed or buffering issues on their stb. If you're using the best mode of connection, do a speed test of Jio Fiber network. Still facing issue, contact Jio customer support.