At the bottom of the Scene Overview pane, you can see the erg information, as shown below:
This text line provides the following information:
Selected: x / y ergs - displays both the number of selected ergs and the total number of ergs in the entire scene. In this example, seven of the overall 64 ergs are selected.
875.6 / 8,458.2 us (10.4%) of scene - indicates how much of the scene's GPU time is selected.
Delta=-2,206.9 us (71.6% better)- indicates how much faster or slower in microseconds (us) and percentage that the selected draw calls now take, based on any changes made.
The color of the text line indicates the nature of the changes made. A green line indicates improved performance as a result of the changes. A red line indicates a degradation in performance.
The Ergs Information field does not display erg timing data on tile-based rendering architectures.