Internet speed significantly slower using Time Capsule

I have a 50MB internet connection and a Time Capsule.  I use the Time Capsule to wirelessly connect my iMac to the internet.  I also have a desktop PC with an ethernet connection to the Time Capsule.  Lately the internet speeds have been very slow when I connect via my Time Capsule.  I experience slow speeds from the wireless and wired connection.  On speedtest.net, I can't even get the test page to load.  On my PC, when I unplug my ethernet cable from my Time Capsule, and plug it directly into my modem, I get fast 50MB speeds on speedtest.net.  When I plug the cable back into my Time Capsule, the speed is slow again.
Does anyone know why the Time Capsule is causing my internet speed to be significantly slower than connecting directly to the modem?  And more importantly, how can I fix the issue?
Thanks, Brian

Hi Brian,
Every couple of months I also experience the very slow wi-fi connection through Time Capsule (currently on firmware 7.6.1 but the problem has occurred also with older firmwares).
I have been able to fix the slow connection this way:
Test your laptop's wi-fi speed to verify the problem. For example, I'm getting only 2 MBit/s download speed at speedtest.net when the Time Capsule slows down, although my operator provides super-fast 100 MBit/s connection.
Detach the (Internet) Ethernet cable from the Time Capsule.
Connect the same (Internet) Ethernet cable directly from ADSL or Ethernet wall plug to your MacBook (or any other computer that experiences the slow wi-fi connection).
Run the Speedtest.net test again. Now you should obviously get "full" Internet speed without Time Capsule (for me it means about 75 Mbit/s, never quite the same the operators promise ;).
Detach the Ethernet cable from your laptop and connect it back to the Time Capsule (wait until the green light on Time Capsule). Test again with Speedtest.net. (Now I get around 60 Mbits/s over Wi-Fi, that is OK). Interestingly the problem now disappears and stays fixed for several weeks or even a few months, after which I simply repeat this process when needed.
I am currently running Time Capsule firmware 7.6.1 but the issue has happened on later versions also. Perhaps you will experience it after running 7.5.2 after a few weeks or months?
For background information I am running on the same Time Capsule's Wi-Fi network:
A white MacBook with OSX 10.7.3
Samsung laptop PC with Windows XP
Two iPhones (3 and old 4)
Playstation 3
Apple TV
Hope this helps!

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