You can use this slider to adjust the simulation speed. Left is slower and right is faster. You can set the default speed for simulations from the Simulation Preferences dialog.
Note: To access this tab activate (i.e., double-left-click) on a loaded g-code file from the Project tab. |
click: 
 G-Code Browser: Simulate, Speed menu item |
1.Left-click and drag the slider to adjust the Simulation Speed. Left is slower and right is faster. |