Is the game running slowly for you? Does it freeze when it's time to take your turn?
The first thing that we always recommend when players are having issues with the game lagging and freezing is to close the lobby page while you're playing. Closing the lobby page cuts down on the amount of background processes running so you're able to have a faster, more stable game.
If closing the lobby page doesn't help to improve your connection speed, we have an article here with a few easy things you can check on your side: https://help.replaypoker.com/hc/en-us/articles/360002234774-Disconnecting-from-games-
If you go through the list of troubleshooting suggestions and still continue to have problems, please send a message to firstname.lastname@example.org with the info suggested at the bottom of that article and we can investigate a bit further.