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Big Ray, thank you for the post!
I'm concerned. Having search off is a definite drawback - massive amounts of resources that can not be accessed.
How do spiders affect the search? Normally siders go through the links, the existing pages. Spiders shouldn't and cannot perform direct searches unless spider is targeted to use the search. I don't know what the case is. But like WG said, image verification is a simple solution - has it been tried before?
If spiders cause heavy load on search, prevent spiders from using it.
If search by itself takes a big load then something can be done with the database and sql queries.
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