what happens if my wifi speed(airport) is fast but my initial internet speed is slow?

No, the AirPort Express cannot receive a signal and make it go faster. The Express will deliver the Internet speed that your modem provides to it, so the maximum Internet speed that your network delivers will be limited by the plan that you have with your Internet Service Provider.

No, an Express (or any other router) connects you to the Internet, it is not itself the Internet. That will be as fast as you are paying for.

The AirPort Extreme will provide the signal speed that it receives over the LAN from your router.

Remember, the AirPorts.....or any other router.....cannot take a signal that it receives and make it go faster.

Bob I have a question for you....I have 150mbps service from Comcast and get 142mbps if I connect wired to the airport extreme, but I can only get 75-80mbps tops using wifi. What do you think the problem is?

Hey Mike,

That can most likely be attributed to a number of things. It all depends on what device you are connecting with, what band you are connecting to and the biggest one, interference. Interference will be your likely cause, especially on the 2.4 GHz band as it is the most crowded. Wired connections are generally faster since they do not suffer from the interference issues that can plague a wireless connection, nor do they have to battle for bandwidth with other wireless devices. Check your router placement for starters to eliminate that. Walls and other electronics can affect your signal. Then check that your device(s) are using the fastest band available. The 5GHz band is faster and less crowded, but has less range and object penetration than the 2.4 GHz band.

Hope this helps you out a little and that it's not too much info!