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Due to the software structure that forums like this use, searches are the most database intensive tasks. Without a delay, bots or people running malicious code could hammer the forum with thousands of requests a second and bring the database to a crawl. That could (in theory) make the forum unstable or unusable for the average member.
That being said, a 20 second delay may provide the same function as a deterrent from abusive search hits and be more palatable to your average member who is just looking for useful information here.
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