I kind of suspected that might be the reason..but you do still have a scalability problem for very large vocabularies. :-) I just did a profile and saw about 1

I kind of suspected that might be the reason..but you do still have a scalability problem for very large vocabularies. :-) I just did a profile and saw about 15% in strcmp in the hot cache run, but sure if it's not in RAM then IO is likely the bottleneck.