Performance when using two computers

I have an iMac and airbook connected to an Extreme wireless internet connection, but when both are being used the performance of each drops considerably. Can Extreme not support 2 devices?
The internet connection is a standard 5000 kBit/s. Do I need to upgrade?
Thanks

The AirPort Extreme base station (AEBS) can easily support two clients. However the RF environment that you are in may be experiencing significant interference and only able to support one full speed client.

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