I have a Motorola Surfboard extreme cable modem, a Netgear R6200 smart wifi router, and Comcast 50mbps internet service.

[thankfulvolcano159]

So I have been having problem since moment one. I got Comcast high speed (50 MGPS) internet. The woman who came to hook it up put the modem/router combo from them in the living room. In my bedroom we were only getting connection speeds of 11-15 mbps. So I called them and they told me to try a WIFI extender. Went to Radio shack, picked up one and hooked it up. It cut the WIFI in my room down to 7-8 MBPS. Went to Radio shack and asked themI what to do. They sold me a Motorola Surfboard Extreme Cable Modem (model #SB6141) and a Netgear R6200 Smart Wifi router (model # R6200.) I hooked it all up. Clled Comcast (for the 18th-21st time in the past three days) and they switched it to the new modem. hooked everything up and tried it out. my wireless speed is only 15mbps sitting five feet from my router. Wired it and it went to 57 mbps. Haven't tried the speeds anywhere else in the house, it's pointless until the wireless starts to work. Any suggestions on what to do?

[SSP Bowl Dude]

Be sure you are comparing apples to apples. Mb/s and MB/s are different. 1 Mb/s is 0.125 MB/s.

These speeds are the maximum connection speed. Every device including set top boxes diminishes this speed. Other users on the trunk also diminish the speed.

You are only as fast as the slowest leg if the connection.

[Adrian]

Your problem is the wireless. maximum user speeds for 54mbps wireless G mode is about 21-22mbps, tops.
Add in a bit of interference or poor drivers, and your 15mbps is about in the right range...
The only way to get more speed out of wireless is to go to N mode on both laptop and router, and even better would be N mode on a dual band setup, using 5.8Ghz on both devices.

You can put in the world's fastest wifi router, but if your laptop has only a G mode adapter, it will never reach those speeds.