One idea might be to implement a lookaside methodology.
Check to see if this search is for the same item as the last, if so return the same results without searching. This would help if there are frequent calls for the same value.
You could expand this by keeping a list of the last X number of values and results, searching it first. For frequent calls with the same values, this would reduce searches, especially of long lists. If same values aren't searched often, the second would hurt performance a little depending upon the size of the recent call results list.
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Maybe I should try making one of these servers...
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