How many unique terms do you have in the faceting field????
Since there are lot of evictions, consider increasing the size of the
filtercache. Try to keep evictions to min.

BTW how much is your index size (GB/MB??) How much RAM is allocated?

Above All:  Have you benchmarked your search? Is searching done in
milis/secs/mins?? I am trying to understand if your search could already be
performing quite good/OK.

Regards
Pravesh

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