> "analyzer only built once"

I think the current suggestion is to run `build_analyzer()` in each process. This should be very fast relative to analyzing the documents.

> Each time `build_tokenizer` is called, it will do the regex compilation, am I right?

Python's `re` caches compilation, but you're right, that won't help across processes. Still, it doesn't take long compared to tokenizing 100 docs (the default pattern takes 128 µs on my system).