Early 2011 13inch Macbook Pro running extremely slow!

Hello everyone,

I am posting here because I am in desperate need of a solution.

My Macbook Pro (Early 2011) is running painfully slow. I've scoured the all over the web for solutions, but none actually worked for me. I also considered buying 8GB of RAM to speed it up, but I want to use that as a last resort. For what I am using the computer for, 4GB should be plenty. The computer isn't even that old! I mainly use Microsoft Word, Pages, and Safari on my Mac. These programs are not that intense and should not make my Mac struggle.

To give you some examples of my Mac's slowness: it takes MINUTES for it to boot up completely-- now I rarely power it down, simply copying and pasting text from a website into a document causes the color wheel to pop up and takes about 5 seconds for the text to actually paste, safari takes about a minute to launch after being quit. These are only a few examples of many on how slow this Mac is.

I have checked Activity Monitor (before and after Mavericks). Under the Memory Tab, the Pie Chart(in Mountain Lion) was mostly red and yellow- not good. I always had about 1 GB of Swap used (in Mountain Lion). Now in Mavericks (which I find very hard to understand Activity Monitor) it shows that (with only safari open) 3.93 GB of memory is being used.

Also under storage in "About this Mac," I have about 120GB of "other." I don't know if this can be a cause. I've cleaned out my documents and completely erased all of my downloads.

If you need anymore information let me know.

Attached are screen shots of activity monitor.

Thank You!!!