Well, web page loading times are generally highly specific on a number of factors outside of your control, HOWEVER, there is a small possibility you have a dying HDD.

So, just as a quick test, start textedit, type some random gibberish, and then go to save it. How long does it take for the save dialog box to show up? If it's more than a couple seconds, then it might be worth taking your laptop somewhere to be looked at. Otherwise, it's likely a factor outside of your control, and outside of your MBP, that is affecting your page loading times.