DLK, you can test your speed: Speedtest.net - The Global Broadband Speed Test
Additionally, Firefox has a few tweeks to attempt to increase speed, many of which aren't recommended for simple compatability issues with websites, etc. I personally use IE9 which seems pretty fast.
As well, you can pay more to increase speed with your ISP. There are certain times of the day where internet traffic is less and video watching is more smooth. Sometimes, upgrading hardware allows you to get better video streaming.
A wired connection usually has the strongest connection in speed. But you can try different versions of the same driver
for your wireless adapter. Some will give differing speeds at times, believe it or not. But the most stable and secure driver is usually the latest driver.