Hello everyone, I have bought a Macbook Pro one week ago.The configuration is given below: Display-13inch HD-750 GB Processor-i7 2.8 Ghz RAM-4GB Till now it is working vesy fast and smoothly and I am quite happy with its performance.However most of my friend says that just like any other computing device,my Macbook Pro will also get slow.And this is what scares me the most because because I am a newbie and do not have enough knowledge on Mac OS system.So here are my question. 1) Do I need to download Mackeeper? 2) How should I delete the junk files ? 3) Do I need to download any apps that keeps my Mac working fast and if yes then please do suggest me one. Thanks a lot.