From owner-freebsd-usb@FreeBSD.ORG  Wed Mar  4 22:08:33 2009
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From: Hans Petter Selasky <hselasky@c2i.net>
To: Artyom Mirgorodsky <man@email.com.ua>
Date: Wed, 4 Mar 2009 23:10:59 +0100
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Cc: freebsd-usb@freebsd.org
Subject: Re: Low perfomance when read from usb flash drive
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On Wednesday 04 March 2009, Artyom Mirgorodsky wrote:
> I forgot to write, that a similar problem was observed in FreeBSD 7 with
> usb4bsd patches.

Here is a patch which I think will address your problem. It is EHCI hardware 
related. Different models behave differently. Try this:

http://perforce.freebsd.org/chv.cgi?CH=158692

--HPS