Safari page loading indicator keeps spinning

Usually when a page loads in safari there is a little "circle of dashes" icon on top by the battery indicator that spins until the page loads then goes away. On my iPhone 4 though, sometimes I notice that even after the page completetly loads the icon is still there spinning and won't stop. Does this have to do with the multitasking function?

The only way I can get it to go away is to close all pages or do a reboot. Can anyone help me figure this out?

Ok. So I don't care about the icon itself. I just want to know if something is running and would drain the battery faster. Even if I close all the apps in the multi-task panel it doesn't seem to stop it.