Something is wrong with your installation. 6.4 is in the same ball park as 6.1 
Can you share the code that runs 20x slower? Thanks — Matthias





> On Mar 1, 2016, at 10:51 PM, vkelmenson via Racket Users 
> <[email protected]> wrote:
> 
> I recently downloaded Racket version 6.4. I have previously been using 
> version 6.1. It is much slower than version 6.1. Several short functions run 
> approx 20 times slower on 6.4 than 6.1. These were run at the same time on 
> the sam matine in succession.
> I am using Mac osX version 10.8.5
>     Has anyone else noticed this? 
> 
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