How come my computer says my internet speed is 54mbps but my provider it's .256 mbps?

[me2]

Although your ISP may be giving an honest 256 kbit/sec, or possibly 256 kbyte/sec, your wireless connection to the router is considerably slower, maxing out at 54mbits/sec.  That doesn't represent the true throughput you're experiencing, which due to overhead tops out at about 22mbits/sec.

To get an accurate view of the Wi-Fi performance, visit http://speedtest.net .  Click Settings, and under Global Settings, set "Speed Measurement" to "kilobytes".  Click Save, then click Take a Speed Test.

Hover the mouse over the green triangle, then click a server..