Why is my internet so slow?

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Recently we've been having troubles with running any sort of video stream such as Netflix or Youtube, as well as with just day-to-day web browsing. We currently have Century Link, run off of a modem, use 2 computers (one is connected and the other is off of wifi), a ps3, and one laptop. This is supposed to be their "high speed internet" and it can't even load pictures on Facebook.

I did a speed test and got: 19.52mbps download speed and 0.74mbps upload speed.

I'm not techno savvy, so this information is practically useless to me, but I'm sure someone out there can decipher this and tell me whether or not my connection seems to be bad.
About a week ago we called in a guy to check out the service and he said everything is running "up to par with exceptionally good speed" however, obviously this isn't right.
All devices are from Apple, including the newest iphone and ipod. The modem we're using (which was JUST purchased for the reason that we thought we'd get faster internet) is called Actiontec C1000A