[R] randomForest speed improvements

[apresley]

I haven't tried changing the mtry or ntree at all ... though I suppose with
only 6 variables, and tens-of-thousands of rows, we can probably do less
than 500 tree's (the default?).

Although tossing the forest does speed things up a bit, seems to be about 15
- 20% faster in some cases, I need to keep the forest to do the prediction,
otherwise, it complains that there is no forest component in the object.

--
Anthony
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