Keeping my eye on activity monitor, it seems to me as though Safari and itunes, two of the programs that are always open on my machine, take up much less processing power. For example, whereas Safari would run between 8-25% during my normal browsing, it's now staying around 3-8%. And I've noticed a drop in my processor temp, too. Normally, it hover around 125 degrees Fahrenheit, whereas now it sticks between 105-115. Anyone else notice a similar change?