Yes. Look at the documentation for the cljs.js load function.

> On Jul 6, 2016, at 11:57 AM, Zubair Quraishi <[email protected]> wrote:
> 
> Hi Mike,
> I didn't necessarily mean that core.async is slow in my last comment, but 
> more that macro evaluation can be slow. The clojurescript macro file in 
> question is here:
> 
> https://github.com/zubairq/BlocklyBuilder/blob/master/src/webapp/framework/client/macros.cljs
> 
> It seems to take at least 5 seconds to compile in bootstrapped clojurescript. 
> So are you saying that I can precompile and cache this file so that the 
> browser never has to compile it?
> thanks
> Zubair
> 
> 
> On Tuesday, July 5, 2016 at 9:11:49 PM UTC+2, Mike Fikes wrote:
>>> i know I have been pushing for core.async to be pushed into master but I 
>>> have since changed my mind as i have seen that running macros in 
>>> bootstrapped clojurescript is very slow
>> 
>> Hey Zubair, 
>> 
>> For a library of the size of `core.async`, I’d recommend making use of 
>> bootstrapped ClojureScript’s ability to cache the results of compilation. 
>> You can at least eliminate 95% of the start up time (with Andare). Here is 
>> an example (where the -K option to Planck enables caching):
>> 
>> $ time planck -Kc andare-0.2.0.jar -e"(require 'cljs.core.async)" 
>> -e"(require-macros 'cljs.core.async.macros)" -e"(cljs.core.async.macros/go)"
>> #object[cljs.core.async.impl.channels.ManyToManyChannel]
>> 
>> real    0m27.401s
>> user    0m36.093s
>> sys    0m0.940s
>> 
>> $ time planck -Kc andare-0.2.0.jar -e"(require 'cljs.core.async)" 
>> -e"(require-macros 'cljs.core.async.macros)" -e"(cljs.core.async.macros/go)"
>> #object[cljs.core.async.impl.channels.ManyToManyChannel]
>> 
>> real    0m1.505s
>> user    0m2.658s
>> sys    0m0.357s
>> 
>> - Mike
> 
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