IMac i5 27" - gigabit ethernet speed slooooooow

I know there are other (older) threads about this (https://discussions.apple.com/thread/2236017?tstart=0) but I thought I'd start a new one.
I have just purchased an iMac i5 27", and find that plugging it into my Netgear GS605 gigabit ethernet switch doesnt work as expected. My older 24" iMac works as espected, just fine.
I am able to get a gigabit connection (green light on switch) and if I try to copy large files form another Mac or my Lacie 2Big Network 2 NAS it works fine. BUT, if I then try to surf the web, my download speeds are ridiculously low (should be 30MB/s, getting 0.4)??
If I manually downgrade the ethernet controller settings to 100B/T, the internet speed works just fine, but obviously local transfers are then crippled to fast ethernet speed, which on a 200GB Time Machine backlup isn't much fun!
I have had many conversations with Apple Support, and returned one of these iMac's already, to find the next one does the same thing - all very frustrating.
So is there a fix? Can the Broadcom chipset be to blame? Is it to do with Jumbo frame support (whatever that is) - the Netgear switch supports it, but not sure about the iMac, and why does the internet speed drop so dramatically, when the file transfer speed works as expected over gigabit ethernet?
Grrrrr. Really frustrating I can't have high speeds on both types of transfer.
Any help gratefully received!

verve62 wrote:
am i just dreaming, or is this unacceptable?
Unacceptable.
btw, i've already tried creating another user, and while things are ok in the beginning, slowly but surely the same symptoms begin to appear and then become chronic.
Have you tried Safe Mode (It will take more time to startup in Safe Mode because it runs a directory check.)
PS: i am sitting here proofreading this, and i can hear the machine every 5 seconds or so, going >"chunk-chunk" - ***!!??
That actually sounds like a bad hard drive. Run Apple Hardware Test
-mj

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Message Edited by Vidmo on 10-12-2008 09:40 AM

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Many thanks for your incredibly detailed reply. All the information in your solution is correct, and while it did not directly solve my problem, it would have taken my a lot longer to figure out the issue without the information you provided.
I didn't realize we're missing so many functions in airport utility 6.0.
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I didn't realize we're missing so much functionalities in airport utility 6.0.
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http://www.versiontracker.com/dyn/moreinfo/macosx/19596
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applejack AUTO
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Dump the VM files for a fresh start.
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Message was edited by: BDAqua

Cisco Catalyst 4507R Module WS X4424GB RJ 45, Multi-speed Gigabit Ethernet Switching Module (24-port)

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HTH
Regards
Inayath
***** Plz rate all usefull posts.

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Message was edited by: macman60

So you agree to the lose of the Airport Express removal has caused me to lose enough of a signal to make the Internet...
Sorry but I'm not sure what this long run-on sentence is trying to say.
You asked if the network could be wirelessly extended and that is what I replied to.

IMac i5 27" - gigabit ethernet speed slooooooow

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