I;ve had a few speed issues with my MacNook after I changed/upgraded the internal hard disk, but not done anything about it until now, as it was getting ridiculous.

Xbench to the rescue :

As you can see it's appallingly slow …..(scores should ideally be around 100)

As my wife can attest - I sleep well, and this possibly confirms it.

This describes the situation in a nutshell

As you can see they report electricity consumption around with approximately 15% difference. One is a Wattson - the other one a costco Envir sensor.

Next - what is the real usage?