What is the speed of T-mobile 3G network

Sometimes, I feel the speed of 3G network is even slower than dialup speed. Today, I use bandwidthplace.com to test t-mobile 3G network. In the late afternoon, I ran it in San Jose, CA, and the speed is about 14KiloBytes per second; In the late night, I ran it in Sunnyvale, CA. I tested it three times and speeds are about 58.2, 79.95, 114.21KiloBytes per second respectively.