Adding the subject tool would help developers and users provide better optimized ArcGIS based solutions. The graphs would show the processing time for the time, tools and report descriptive statistics for data in the project... The graphs could also be expanded upon to address ~the rendering cost for various symbologies...
The idea arose from what appears to be changes in the way symbology is rendered between ArcGIS 9.3 and 10.1.. It seems symbologies that rendered quickly in 9.3 no longer render as quickly in 10.1.