XP/Bootcamp 3.1: Slow Keyspan USA-19HS USB/Serial -- new Macbook Pro 17"

I have a new Macbook Pro 17" running Windows XP on Boot Camp 3.1. I am using a Keyspan USA-19HS USB/Serial adapter with its latest driver (from Tripplite that now owns Keyspan). The XP was originally an SP2 install but was updated with all Microsoft updates before installing the Keyspan.
I previously used this same Keyspan with Windows XP/Boot Camp 2.x, and with this same Keyspan driver, on an older Macbook, and it ran just fine for years.
On my new Macbook Pro, it runs without complaints or failures, but it runs at about 1/4 the serial throughput that it should have. I have compared the COM port settings for the Keyspan with those on the older Macbook and they are identical. Using 19200 baud. Device Manager shows no problem indications.
Any suggestions?
--Bob

I have the same computer and the same issue in Bootcamp. I haven't noticed any correlation with a context menu however. Hoping for an updated driver soon to fix this...

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<Edited by Host>

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XP/Bootcamp 3.1: Slow Keyspan USA-19HS USB/Serial -- new Macbook Pro 17"

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