I'm new to Mac and curious, is this normal for all Mac OS? To take as much ram as possible or is it something new to Yosemite? mostly it stays 7 and I have 8 total? Are they gonna fix this? I'm asking mainly because Yosemite is kind of choppy especially after 10 minutes of using it, apps open kinds laggy especially Safari. It's a rMBP 2014. Should I downgrade to Mavericks? Will it be better without lags?