Performance Enhancements

[kanaka]

The cljs-in-cljs compile is slower than the regular ClojureScript compiler. I suspect there are some low hanging fruit that could be addressed easily to increase performance. Using profiling tools might reveal some areas to address.

Also, another area of interest would be to add support for output of asm.js code: http://asmjs.org/, http://asmjs.org/spec/latest/ This could potentially result in significant speedups especially for the persistent data structure implementations.