I had major issues with lag on other mobile sites, which is why I started looking for a better optimized platform. I highly recommend giving https://tikitaka.me.uk/ a try for mobile play. I have been playing their live blackjack tables on my smartphone for a few weeks now and the connection has been flawless. You do not even need a dedicated app, as their browser interface handles the high-definition streams perfectly without any random logouts mid-hand.