Besides the speed tests (which you should run on Testmy.net, by the way), what else have you done? Have you tried clearing the DNS? You can also try clearing cache, cookies, history, for all your browsers. Have you turned off the modem, waited a few minutes, then turned it back on? Sometimes that helps. Keep in mind also that the latency for satellite is high, so sites will feel more sluggish, though in your case it seems things are too sluggish.
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