On rare occasions I’ve seen reports where the RSD URL (which looks like http://example.com/xmlrpc.php?rsd in WordPress) will take a very long time to load (3 minutes or more) even though the rest of the site responds very quickly. This can cause problems for XML-RPC clients (like the WordPress iPhone app) if they timeout trying to get the RSD data. The reports of this problem were few and far between, without much of a common thread. Until today.
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