If you are playing the game with multiple pages or programs opened, close them all and see if that improves the performance of the game.
Visual quality can be toggled at the main menu or in the game. There are three levels of visual quality: High, Mid, and Low.
High: The highest-quality setting.
Mid: Graphics are the same as High, but some gameplay animations are removed.
Low: Graphics quality is reduced and many gameplay animations are removed.
At the main menu:
Click this button to toggle visual quality.
Additionally, you might want to clear the browser’s cache. Directions on how to do that can be found here:https://bit.ly/clearingcache.