Yosemite slowing down Macbook Pro
Ever since i've installed the new Yosemite OS X, my Macbook has slowed down (CPU usage spikes up rapidly, RAM 'Memory' usage is always above 5-6GB with nothing running) is this normal?
NOTE - I have a 13" retina with 8GB RAM, i5 CPU, 256GB SSD. It was never like this, i'm actually experiencing some lag now....
Why is this happening and would it be better to upgrade from a 13" to a 15" MBP?
MacBook Pro with Retina display, OS X Yosemite (10.10)