Hi,

We are experiencing quite a performance decrease when searching for phrases
that have terms with a high ttf value.

E.g. searching for "note of sale" is around 3 times slower (~10 sec) than
the "bill of sale" `(~3 sec). This behaviour is consistent and can be
reproduced als when we use other terms that have a high ttf. We are
querying the unstemmed index.

Terms (numDocs: 26220184):

   - "bill" -> df = 1.879.324, ttf = 14.145.950
   - "note" -> df = 8.479.826, ttf = 151.249.542
   - "sale" -> df = 7.557.685, ttf = 12.0948.163
   - "bill" -> df = 21.244.060, ttf = 6.879.196.700


Is this the expected behaviour or is there something that can be
tuned, like a cache setting?

Thanks,
Sjoerd

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