HP Search/XL User's Guide

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After HP Search updates the indexing file, future searches on the files indexed run about twice as fast as
when they were initially searched. However, once these files are modified, they must be re-indexed before
they will be searched this fast again. (This is because HP Search ignores the information in the indexing
file for a specific file if that file has been modified since the indexing file was last updated.)
When to Use Indexing
Because the job stream to update the indexes for a set of files takes twice as much CPU time as simply
searching the files, many times you should not specify the INDEX option. For the most efficient search
performance, specify the INDEX option whenever you expect to search a file at least three times before
modifying it.