Performance

[sckott]

I've played around a bit, and we seem to be slower than rgeos in the few comparisons I've tried. Should profile lawn code and see if there's anything we can speed up on the R side.

[sckott]

Possibilities:

• javascript code generation (e.g., http://mrale.ph/irhydra/1/, https://www.npmjs.com/package/generate-function, https://github.com/scijs/ndarray/wiki/ndarray-module-list#core-module) - probably not something to try first, try after R optimizations have exhauseted themselves
• maybe there's bottlenecks in json serialization, take a look there