Macbook Pro medio 2012 keeps lagging & showing beachballs after every action

I have a MacBook Pro medio 2012 for a few months now, it always worked good for me but since a few days all my actions make it to lagg and after a while I get beachballs every several seconds and all for all actions I have to wait a few seconds for it even to respond at all.
It runs on an i7 processor and has 8 GB RAM so that cannot be the issue, besides that has it always been a fast laptop.
I also run boothcamp on it with windows on that participation, when i use that it does not lagg. So is has something to do with the MACOSX part, since windows runs fine on it.
The lagg came out of nothing, I just run a webbrowser (FireFox) and Spotify, mail and iCal are on the background, but those can't be the problem.
I hope any one has a solution for me.

I have followed them and I noted that at his step about RAM he says: 'If the page outs value is too high – more than 10% of the page ins value – then that is an indication that you could benefit from more RAM.  If it isn’t that high, adding more RAM won’t help.'
Here is an image with my stats:
As you can see the page-outs are far higher than 10% of the page ins, and I am currently just running light programs, with the only exeption maybe of FireFox, but that should not make the diffence.
The problem I have now is: How can this be? Since I have 8GB RAM and it used to be no problem. Also note that I have no problems running Windows, windows runs just fine, via boothcamp.

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