Speedtest.net shows slow speeds also.
Cox and Speakeasy both use Atlanta and Phoenix. Cox's reported upload speed to Atlanta was slightly faster for me than the corresponding upload speed reported by Speakeasy, but Cox's reported upload speed to Phoenix was significantly slower than Speakeasy's speed to that city. (The upload speed to Atlanta was about double the speed to the other cities I tested with Cox's speed test tool, including some cities that were closer to me). It appears the city you select for testing can make a bigger difference in your reported speed than the speed test tool you use. I would suggest trying a number of different cities to get a better idea of your upload speed.
