Here, some results on the 20 newsgroups dataset:
Classifier train-time test-time error-rate
--------------------------------------------
5-nn 0.0047s 13.6651s 0.5916
random forest 263.3146s 3.9985s 0.2459
sgd 0.2265s 0.0657s 0.2604
Optimizing everything properly should allow to gain to some
percents. Here, the gist https://gist.github.com/arjoly/8732555
for those who wants to play
Best,
Arnaud
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