Hi, This is frustrating because I consider this 1 day old refurbished Macbook Pro an upgrade from my desktop. I love the notebook, it's very silent and I am enjoying the peace and quiet in my room. This is my first time using the Mac OS, still getting used to. Been searching and reading for info about this new computer of mine. My siblings have had the Macbooks for 3-5 years now, so I know a small part of how to use the OS, but they can't really help me with this topic. My old desktop PC has GTX 260 1GB graphics card, 2.7 GHz Dual Core, and only 4 gigs of memory RAM and a couple of simple hard drives. I had an extra 1TB hard drive which was basically full, so I think that doesn't matter. This rMBP I have purchased is the February 2013 one, the supposed 255 GB Flash storage, GT650M 1GB video, 8gigs of memory RAM, and 2.4 GHz i7 Intel which I believe is a quad core. Coming in to Mac, I knew the OS seemed memory intensive. I don't have a lot of money, I went and purchased what I think was the most bang for the buck, so I got the one with 8gigs of memory, which should be more than enough! I check the activity monitor consistently, I disabled the Spotlight feature, dashboard, and notification centre to free up some RAM space, but I'm still disappointed at what I see with the memory usage. It uses half of my 8gigs all the time, what is causing that? I have read that the Macbook Pro uses the memory in some way, that basically all memory must be used, that because you paid for the 8 gig, thus it must be used instead of just sitting and idling. But still, I am experiencing some lag issues. I don't really believe in that type of memory usage anyway. I have noticed this intensive memory usage. I noticed whenever I watch YouTube videos not in HD but fullscreen, the video consistently lags, and the sound also, cracks. This is what brought me here. I can't let this past 14 days knowing my noisy, ***** desktop runs better. Even when I am not watching any videos, I notice some random lags just when browsing with Firefox or Chrome. Even when I'm gaming, Counter-Strike Source, on this mac, it lags consistently, it's not smooth. The point is that all these processes and applications I'm using, I've been able to do with my old desktop PC, multiply those tabs by 2-3; with a game running in the background (CSS, Dota 2), and iTunes playing. Now I'm pretty sure if I play a 4gig mkv file movie on this mac it will not be smooth as well if this is not going too smooth right now. Sometimes I even run Chrome with those tabs at the same time with FireFox with the same tabs with my desktop, and it doesn't lag. I should be able to do all of this with this newer and higher end laptop, for this price especially. What is going on? Is this the norm of this laptop, do I just have to deal with this for the rest of this investment? I'm not willing to do that. How can I fix this, is this even fixable? I am planning on installing Windows OS here on this laptop, will running Windows have smoother performance compared to the Mac OS? Please don't tell me to just buy a Windows laptop, we all know what they are missing out on. It doesn't matter if I'd like to use Windows on a Macbook Pro, I would buy just the hardware only and install a Windows OS only if it was possible or easy. I would like to stick on this laptop, and I hope I can find some solutions or explanations. I still have 12 days to go for the free return, and I hope I won't have to do that. The Macbook Pro is really a good laptop. Can you please help me, thanks!