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>>Check the indexes on your backend. If you are using SQL Server, do you have a clustered index?<<
JVP raises a good point, but there is a quite a lot to this. Commands like REINDEX against clustered indices can reorganise in the interests of efficiency. You can check the Consistency of your data to measure this- performance is definitely affected if your data is scattered widely wrt the main search index.
Before adding clustered indexes willy nilly, however, I recommend that people call on highly expert advisors. Those of my customers who do this consider it money well-spent.
Regards
JR
"... They ne'er cared for us
yet: suffer us to famish, and their store-houses
crammed with grain; make edicts for usury, to
support usurers; repeal daily any wholesome act
established against the rich, and provide more
piercing statutes daily, to chain up and restrain
the poor. If the wars eat us not up, they will; and
there's all the love they bear us."
-- Shakespeare: Coriolanus, Act 1, scene 1