If I am anticipating correct regarding your issue of performance.
You need to do the Profiling first and check for the methods responding slow.
1.Profile the queries
2.Check the Estimated Execution Plan for the queries
3.Check for the Indexes, if not added add them.
4.Go for a performance tuning first.
If you are using searches, then try using Full Text Search
Understanding Full-Text Indexing in SQL Server[
^]
Thanks