To bring up the console, press the tilde key, which is just above the tab key.
Type in “render.drawfps 1” and press enter to display your framerate in the top right corner of the screen as shown below.
Type in “render.perfoverlayvisible 1” and press enter to view a graph with details on your CPU and GPU performance
As many have noticed, player pings are not displayed in the score display (tab key) in BF3. However, it’s possible to display your ping by pressing the following key combination: Ctrl + Alt + S. This will make the text box shown below appear in the top right corner of your screen. The “IGO Time” indicates your ping to the server.