[Lucene-java Wiki] Update of "ImproveSearchingSpeed" by TokeEskildsen

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The following page has been changed by TokeEskildsen:
http://wiki.apache.org/lucene-java/ImproveSearchingSpeed

The comment on the change is:
Recommended profiling

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   It can be much more efficient to restrict results to a part of the index using a cached bit set filter rather than using a query clause. This is especially true for restrictions that match a great number of documents of a large index. Filters are typically used to restrict the results to a category but could in many cases be used to replace any query clause. One difference between using a Query and a Filter is that the Query has an impact on the score while a Filter does not.
  
+  * '''Find the bottleneck.'''
+ 
+ Complex query analysis or heavy post-processing of results are examples of hidden bottlenecks for searches. Profiling with at tool such as [[https://visualvm.dev.java.net/ VisualVM]] helps locating the problem.
+