I've created a version with some explanations about performance issues... https://gist.github.com/lispm/e9372894519f8e6feae1 https://gist.github.com/lispm/e937

I've created a version with some explanations about performance issues... https://gist.github.com/lispm/e9372894519f8e6feae1 https://gist.github.com/lispm/e9372894519f8e6feae1