Does anyone know how metaname searches are done on a swish index?  I 
have a largish swish index (around 1 gig) that performs quite well 
except when doing searches that contain multiple metanames.  For 
example:

-w '(america OR clinton) AND (owner_id=xxx OR owner_id=yyyy OR owner_id=zzz OR ...)

But with anywhere from 10 to 100 metaname=key strung together with ORs.

Also, I've noticed that repeating the query speeds results 
dramatically.  I assume that swish stores some portion of the index in 
memory as slightly modifying the query slows result time.  Is there a 
way to force swish to store the entire index in memory before any 
querries are done?