What are you using as your browser on Yosemite? I keep using Safari strictly because it's faster, more energy efficient, and allows me to use my Macbook Air all day without having to charge it. This is not possible with Chrome. I love using Chrome Canary, but the amount of CPU% it uses is horrendous. Also, its constant red colored "Google Chrome Helper" doesn't ease me. Safari + Adguard = Amazing. Chrome + uBlock = Fast - Battery Life.