Pages Not loading or loading very slowly

We have a home network, two laptops, one iMac. We were all having problems with the internet cutting out on us and it got to the point where unplugging the modem and router no longer did any good. My son with the iMac, which was never having any problems, ever, just quit using it, because he said he no longer could use the internet.
I always thought it must be the router and even got on here and asked if the Airport's go bad, but something recently caused me to think about the Comcast modem.
So I did the same thing and searched for info on cable modems going bad, sure enough there was much to read about that! So we went and bought our own modem last night, called Comcast today to hook us up on their end, and his iMac will work good for just a few minutes, then it starts acting up and keeps saying "loading" when you try and go to a site.
So, how about the internal card or whatnot that speaks to the airport extreme? Can this be the problem? Is there something maybe we can do or check to get this working good once again, now that we have a new modem and eliminated that problem?
Thanks for any help here!
Jeff

Welcome to the discussions!
If the iMac works well at first, but then slows after a few minutes, that is a classic symptom of interference from a cordless phone or another nearby wireless network. Microwave ovens and other nearby electronics can cause issues as well. It may take some experimentation like turning off the cordless phones (if you have them) for an hour or so to see if the wireless signal improves.
If no luck on that front, download a utility like iStumbler if you can on the iMac to display the signal strength and noise on your network. Ideally, you want at least 50-60% signal strength at the iMac with noise less than 10%.
Note the channel that your wireless network is using and compare that to any other networks that are displayed. If you see another network on the same channel or even a close adjacent channel, try changing the channel on your wireless router to look for less congested airspace. Depending on the location of your residence, you may see a few other networks or a lot of networks if you are in close quarters like an apartment complex.
If you still have problems with all computers, then it is time to suspect the wireless router and work from that angle.

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