There are a number of possible answers, but I checked with Alexa and discovered 56% of the websites checked are faster than Hubpages. So why slow:
It could have to do with your internet provider and your Internet speed.
It could have to do with Traffic on the site its self.
It could have to do with the path that you are routed to the site, remember that the internet is not a huge cloud, but rather a number of transmission points that take you from place to place. It is called the WEB for a reason, look at a spider web and think of your connection as one point where two silk threads meet and the place you are going to as another point. Although you might be next to the point you are going to you might be directed to a point in the opposite direction and you may be passed along a number of points before you get where you are going, a bit like those mazes you did as a child. To all of that the speed of those points could also affect your journey.
Want to see your trip, bring up command line and ping hubpages:
That will tell you how long it takes to get there.
Tracert will show you the path
Hope this helps.
Author of "Jonas Watcher: The Case of the Running Bag"