You should rather ask where you can get a new device to play on because none of the online casinos I play really lags. Try Coin, they seem to have a light software overall.
I used to play at Pokerstars Casino. Sometimes there were delays, but the video quality was generally good. It wasn't regulated in my country, so it's no longer possible to play!
For me, smooth gameplay matters more than fancy graphics. I hate when a game lags right before a result. A stable connection and clear video make the whole experience way better.
