Avoid excessive remote requests on oEmbed lookups
I noticed that each time a notice was accessed it'd do a remote lookup with HEAD (and continue despite 404 etc.) and then another attempt to download the resource. If this wasn't successful new attempts would be made for each loading of the resource, which is extremely resource intensive. Whenever we can say "it's been n seconds since the last attempt" we could probably enable this again - or just manually reload remote thumbnails (as part of the StoreRemoteMedia plugin etc.)
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