Short answer is no. The CMOS battery is only there to keep the BIOS clock running and any changes to the default BIOS settings saved. (So a PC with a dead battery will have a clock that resets every time it shuts down, and you won't be able to save BIOS changes after power off).
However, given that the CMOS battery does play a part in BIOS settings, it is possible that some/all have been reverted to manufacturer's defaults which could cause slow performance (but is quite unlikely).
|