Roblox provides the option to set Graphics Quality automatically, with graphics controlled by the computer, or controlled manually by the player. To adjust the graphics setting, perform the following:
1. While in a game, click on the menu icon, located in the upper-left of the screen.
2. To have your computer set Graphics Quality, change the Graphics Mode line to 'Automatic'. Otherwise, change it to 'Manual' and move the Graphics Quality slider to the right for better graphics, or to the left for better performance.
3. Click Resume Game or hit ESC on your keyboard to return to your game.
For more information on gameplay and building related matters, please check out the following links: