I have to say that I believe this rig is still pretty powerful.
Good CPU's last, you have a good one. gone are the early 2000's when an upgrade easily doubled or tripled performance. My first CPU was 166Mhz, next CPU was 750Mhz, the CPU after that was 1800Mhz. then 3.06Ghz, and for the last 8 years 3.2ghz.