Why is my 3GS a 5th of the wifi network speed in my house?

I have a strange problem.
I have a MacPro, an Air and an iMac all hooked up via Timecapsule wifi + 2 Airport Express for better signal in our house.
When only the iPhone is turned on, the speedtest shows me that is has full 10 mbit access to wifi.
When I turn on any of my computers, they also show 10 mbit access.........
But then the iPhone speed/access drops to a 5th (around 1-2 mbit).
Why???? This is really annoying, as I do a lot of streaming to my iPhone and 1-2 mbit is too slow.
Why do I need to turn off all my other computers to get max speed on 3GS?

some questions...
what speedtest are you using to get these results on the computer... is it one located on the internet?
what speedtest are you using on the iphone... does it connect via mobile safari or is it a testing app?
do i understand correctly:
iphone only (all computers off) the internet speedtest shows 10M down and something up
computer only (iphone other computers off) the internet speedest shows 10M down and something up
but when you have a computer and the iphone on the speed on the iphone according to the internet speedtest shows 2M down and something up
is that correct?

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Why is my 3GS a 5th of the wifi network speed in my house?

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