Sport betting: is it mobile friendly or laggy like the others?

I'm always on the go, so mobile experience is crucial for me when it comes to sports betting. Before I sign up, can anyone tell me if Sport Betting's mobile platform https://kmbeautybar.com/ is actually usable? Does it lag during live games, or is it smooth and responsive like they claim? It's frustrating when you miss out on good odds because the app is slow.