Celeron E3300 vs Core 2 Quad Q8200 - Q8200 lag

 
Hi people, I have two computers here and one uses the first CPU, without problems with MetaTester, the second case the Q8200 lags the computer when all the agents are online, it's weird since the Q8200 should be more powerhorse, not? Why with Celeron it's perfect and with Q8200 a disaster?
 
Why are you using celeron?