FPS (Frames Per Second) indicates the rendering performance of your system with the current project.
To show or hide FPS display:
1.Click the Preference button to display the preferences dialog box.
2. Check or uncheck the Show FPS check box to show or hide the Frames Per Second information on the 3D preview window. You can press hotkey CTRL-F to toggle FPS display on/off. FPS information can be displayed during playback period.