It means just deleting auctions that ended a long time ago... The less data the site has to cull through, the faster it'll run. Other big sites clear out their old auctions regularly but I never really liked to do it because it eliminates the product history tied to closed auctions.
I now clear it out periodically, although I don't believe this slowness issue was caused by the auction site at all...but instead by a flood of spammers trying to sign up. This is now resolved with the new software...
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codeVore93
Owner/Operator
GothAuctions.com