Last I checked, on our Clojure back-end, instrumentation was taking up 2% of 
our total test running time. This is with jdbc's instrumentation disabled 
though; I think it's significantly slower due to its extensive usage of s/or 
s/alt and spec regexes. Our specs are almost entirely s/keys and clojure.core 
predicates.

Our fn spec coverage is 47% on the back-end. So the performance impact of 
instrumentation really hasn't been a concern.

On Fri, Sep 22, 2017 at 10:18:52PM -0700, Didier wrote:
> > The goal is to add the macro to orchestra, as a tool to help encourage 
> > spec'ing all functions.
> 
> That would be great. My macro for now was also not supporting all defn cases 
> yet. And it automatically instruments the fn with orchestra. So if orchestra 
> had a more complete one defacto, I wouldn't need one.
> 
> For performance, I've been thinking that caching validation (with some 
> configurable cache bounds), or having sample based validation, so validating 
> only a percentage of calls, and maybe even having the sampling rate 
> controlled by execution time metrics, or cpu metrics or call rates, etc. 
> would be interesting possibilities. So in prod, you could tweek the 
> validation to only get as much of it as you can afford.
> 
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