how badly does encrypting the root file system crush my performance?

[Alan]

>
>   the context here might make this question inappropriate, but i
> installed f9 alpha inside virtualbox in two different ways, with only
> one difference -- whether the all-encompassing root file system was
> encrypted or not.
>
>   within virtualbox, the encrypted VM is *waaaaay* slower than the
> unencrypted one.  should i expect the same performance difference with
> regular hard disk installs?  just curious.  i expected a difference
> but this is *hugely* noticeable and almost unusable.

That sounds like an artifact of virtualbox.  I am using full disk
encryption on F9 alpha and I am seeing little, if any, slowdown.  Maybe
64-bit helps.

What kind of processor are you using?  Does it have the hardware
virtualization extensions?