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What kind of processor was your previous one? Mhz are not comparable one to one. My Core i7 has a lower clock speed than the AMD processors, but can do more per clocktick.
 
What kind of processor was your previous one? Mhz are not comparable one to one. My Core i7 has a lower clock speed than the AMD processors, but can do more per clocktick.
Celeron 540 (Merom) vs Athlon X2 are rather close clock for clock. It sounds like it is the graphics chipset being slow (hence slow even when paused when no pop calculations are being done). The Radeon X1250 is also an integrated chipset and is complete crap. Drivers might help a bit.