Slow network after Lion upgrade

Since I upgraded all my Macs to Lion, my network transfers are terribly slow over gigabit ethernet. My network info is:
I have a Time Capsule
Acting as my home router
I connect to the internet through it
I have a DroboFS connected to the Time Capsule via cat 6 ethernet (it is running the most current firmware)
I connect to the Time Capsule via Wifi and gigbit ethernet (all cabling is cat6 ot cat5e and all links report as gigabit)
I have a netgear switch (gigabit) connected to the Time Capsule (via cat 6 cable) and have one Mac connected to the switch via cat 6 ethernet
I have an Aiport Express conected to the switch for a separate wireles network for non-N connections (802.11 g/b/a)
File transfers over wifi do not seem any slower, but doing file transfers over the gigabit ethernet is terribly slow - in the under 100 kilobyte per second range. This is especially true if I try to move multigigabyte folders between the Time Capsule and the DroboFS, using the Mac connected to the netgear switch. This is also true moving files from the Mac to either the Time Capsule or the Drobo. Time Machine backups are also painfully slow.
I have changed out the switch and it has not made any difference. I have connected the Mac to the Time Capsule directly - bypassing the switch (i.e. nothing is plugged into the switch) to make sure the switch is not the problem - and it isn't. The slow transfers happen with or without the switch. In addition, the computer will often freeze while transferring files.
I have change the DNS to OpenDNS. This made no differnce. I deleted the ethernet service in the networking preference pane and re-added it. This also made no difference. I power cycled all the devices - Mac, Time Capsule, Drobo, switch. Again, no difference.
I had none of these issues with Snow Leopard. If anyone has any suggestions on resolving my slow network issue, please let me know. Thanks!

Am having the same issues. Taking painfully long time to even copy 20Mb file across our network. We have 3 Lion clients 1 Leopard connected to Tiger Server all up to date with their versions. The network was fine until loading clients with Lion, although it seems to have deteriorated a little.

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oh_okay
Level 1 (0 points)
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[click on image to enlarge]
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