here is my try to detect with VirtualVM some hot spots with VirtualVM.

Enviroment:
A newly started node with ~15 times the query:
http://yxz/solr/hebis/select/?q=darwin&facet=true&facet.mincount=1&facet.limit=30&facet.field=material_access&facet.field=department_3&facet.field=rvk_facet&facet.field=author_facet&facet.field=material_brief&facet.field=language&facet.prefix=&facet.sort=count&echoParams=all&debugQuery=true

Ordered by self time the top methods are:
org.eclipseutil.BlockingArrayQueue.poll():                           
260s(self), 260s(total)
org.apache.lucene.index.FileInfos.init()                              
90s(self),  90s(total)
org.apache.lucene.index.FileInfos.FieldNumbers.addOrGet()             
60s(self),  60s(total)
org.apache.lucene.index.FileInfos.Builder.addOrGetUpdateInternal()    
51s(self), 121s(total)
org.apache.lucene.index.FileInfos.Builder.finish()                    
13s(self), 102s(total)
org.apache.lucene.index.FileInfos.Builder.fieldInfo()                  
9s(self),   9s(total)
org.apache.lucene.index.FileInfos.Builder.add()                        
4s(self), 126s(total)
org.apache.lucene.index.FileInfos.MultibleFields.getMergedFieldInfos() 
1s(self), 229s(total)
...                                                                    less 
than 1000ms

Ordered by total time the top (non http/jetty) methods are:
jetty ...                                                           231s(total)
org.apache.solr.handler.component.SearchHandler.handleRequestBody() 231s(total)
org.apache.solr.request.SimpleFacets.*                              230s(total)
org.apache.solr.handler.component.FacetComponent.*                  230s(total)
org.apache.lucene.index.*                                           125s(total)
org.apache.lucene.search.*                                           .3s(total)
...                                                                 less than 
300ms

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