I'm not sure that performance and security aren't interchangable concepts. While the implimentation of dash did improve performance it did also mitigate the effects of the Shellshock vulnaribiliy discovered last year.

On Tue, Mar 17, 2015 at 9:32 AM, Loui Chang <louipc.ist@gmail.com> wrote:
On Mon 16 Mar 2015 14:34 -0400, R Russell Reiter wrote:
> On another note, I notice Debian implemented dash to try to deal with
> exploits. Does anyone know offhand what Fedora has implemented, or is all
> this handled through SElinux policy management?

dash is for performance, not security.
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