Internet speed in Snow Leopard slows down because of connected External HDD

I have two external Iomega harddrives that I connect through FireWire 800 to my MacBook Pro 17".
I noticed, when the harddrives are plugged in, safari lags and slows down tremendously. As I eject my harddrives from my MacBook Pro, the internet miraculously comes back at normal speed. The harddrives are just mounted, no data is being transferred.
I am not sure why this is, or why external harddrives would bother my internet connection. I am connected through my Airport wirelessly to my home router. Other computers get wireless internet fine as I notice this problem with my MacBook Pro.
Anyone know why this is happening and how to stop it? I notice restarting sometimes helps, but this problem comes back after awhile.
Also while I am mentioning this, I also notice the internet slow down when the MacBook Pro runs on battery. Anyone know why this is, and how to fix it as well?
Thank you, and Happy Holidays to all!

I do not notice any connection between my external harddrives being connected and internet connection no more. So that is good.
What I have been noticing though, is my MacBook Pro at some points loosing connection to the internet. The Airport icon in the menu bar says it is connected to my wireless internet at full reception. But at times Safari and Firefox are just not working. I try reseting my internet routers and the problem still exists. It comes down to me having to restart my MacBook Pro, which seems to fix the issue.
I have a iBook G3 with Tiger, and a Dell laptop with XP, and they both receive wireless internet fine when in use. And this is while my MacBook Pro is not.
I am not sure what the issue is now. Right now I'm not sure if there is anything I can do to fix this besides contacting apple and using my applecare.
Is there any internet connection problems similar to what I just described I should be aware of? Thanks in advance!

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http://speakeasy.net/speedtest/
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3. c. I would recommend that you attach your printer via a wired connection (Ethernet cable) to your router if you can. It is by far easier to set up and more reliable in the long run. I can help.
The wired and wireless sides of a router talk to each other. By the time it gets to the router it really does not care if the connection is by wire or wireless, it treats all "clients" the same. That is why I recommend to wire your printer to your router and keep a wireless connection between your computer and router.
Say thanks by clicking "Kudos" "thumbs up" in the post that helped you.
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Internet speed in Snow Leopard slows down because of connected External HDD

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