Weird Internet Problem

I've been experiencing a major slowdown in my internet connection over the past day. I'm on cable, so I figured perhaps there was a problem with my neighbors using too much bandwidth or perhaps just an isp problem. The thing is, downloads are are really fast. I just did a speedtest and everything looks ok. It's just when surfing the internet pages take a while to load. My ping time is low too, so I don't have any ideas what could be happening. I reset my router and cable modem. Any ideas?