I do not know whether this is bug or not. But calculating facets with group.facet=true is too slow.
I have query that:
1. All queries with group.facet=true:
2. Without group.facet:
- First query:
- Next queries:
So I think with group.facet=true Solr doesn't use cache to calculate facets.
Is it possible to improve performance of facets when group.facet=true?