slow system performance after switching to battery on my laptop

[Gabriel M Dragffy]

I noticed that when my laptop (sony vaio fs115e) runs on the battery my
system runs A LOT slower. Can I avoid this?

Now the problem is that even though it's plugged in to the wall and it's
been rebooted several times everything is so slow, the screen savers
jerk across the screen at like 1fps and my game gl-f117 that used to run
silky smooth at like 60fps is also reduced to just one frame a second.

How do I get my computer to wake up and turn on the rest of the CPU
power? I assume it's an ACPI problem or something. I don't even know
where to begin looking so please help if possible.

Regards,
Gabe