Mac loads slower than usual.

Well, my Macbook [white 2,1] has been running at a normal speed and all, but up until a few days ago, my internet has been noticeably slower. I view a lot of pictures and manga/comics online, so when i click to go to the next it loads very slowly, Youtube videos take a long time to load, and buffer every few seconds.

Normally, they would go smoothly and fast, I'm wirelessly connected to my router which hasn't changed and I've been in the same area of my house too. The desktop and other laptop that my family members use don't have this problem either. My family uses a Telus cnnection.

I've already cleared cookies and cache, I went into the Cookies folder from spotlight and deleted all inside it and emptied trashbin.

I'm asking for any advice or help PLEASE!! I'm pretty desperate and I like to perfect or fix any problem because it nags me alot.