From owner-freebsd-questions@FreeBSD.ORG  Wed Nov 22 22:53:17 2006
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Date: Wed, 22 Nov 2006 23:53:02 +0100
From: Andrea Venturoli <ml.diespammer@netfence.it>
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To: VeeJay <maanjee@gmail.com>, freebsd-questions@freebsd.org
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Subject: Re: Does disk encryption causes a performance penalty for
 Data	Access/Read/Write, etc
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VeeJay wrote:
> Hi
> 
> Does *disk encryption* causes a *performance* penalty for Data
> Access/Read/Write, etc?
> 

*Yes*.
If your disk is faster than your CPU, I/O will slowdown.

I've seen an Athlon64 4200+ use up to 90% of its computing power just to 
transfer files from an NFS server to a local SATA disk.
In case the CPU was less powerful, or otherwise busy doing something 
else, total throughput would have decreased.

  bye
	av.