Does the slow browsing happen all the time, and with just about any site you go to? Does it happen with all of the browsers you have tried (if you have more than one)?
What Operating System and browser are you using? Are you directly connected to the modem with a LAN cable or are you using a wireless router?
It could be caused by a lot of things, but the first thing I would make sure of is that your computer is "clean", as in free of malware and viruses. Hopefully you have an antivirus program on your computer. Many also detect and clean malware, but a very good supplement to the malware part is Malwarebytes. It's free, and it can detect a lot more malware than most antivirus programs.
Also, just as a heads up, Malwarebytes can take a seemingly long time to update when using Hughesnet. I don't know why this is, but I suspect it has something to do with the high latency inherent to satellite internet. Mine sometimes takes up to around ten minutes before it will finally "catch" and download an update.
Actually, I should have asked this question first: When you say that your browsing experience is slow, do you mean that it takes a little bit of time for the browser to start opening the page, or do you mean that it takes the page a long time to open?
The latency inherent to satellite internet can make it take a second or two for the browser to even get to a page to start opening, and if coming from a land based ISP, which has latency that is almost unnoticeable, it can seem like there is something wrong, as mentioned by BirdDog. If the page is actually taking a while to open, that's another story.
Again, I should have asked this question in the first place.