There is more to performance and productivity than timing whether one command is .0002 or .00012 seconds long and that is productivity of tasks you perform using the software. Think about it for a minute, simple things right-click and or middle wheel functionality and how you could not work the same speed without them now as is the case for me when going back to play with AutoCAD R14 that has no middle wheel mouse functionality to double click zoom extents. There are many features in the past releases up to AutoCAD 2008 that streamlined the work flow and process to have a net increase in productivity ala do more in less.
The findings from independent and well respected industry research firm Cambashi:
• AutoCAD 2008 is significantly more productive. On average, architects using 2008 completed the exercise 26% faster than those using 2005.
• Training makes all the difference – AutoCAD 2008 users who invested time in a short period of training were substantially faster.