That would mean it's not working then (even with vBulletin), vBulletin won't throw errors if the datastore cache you're using is failing to store/fetch, it'll just keep using the database and make 0 difference. The tests done by vB Optimise verify everything is working with your operator by executing the tests, as a means to identify if it is/isn't working and pin-point exactly what isn't.
I'd check to make sure your Memcached instance is running and running with allocated memory, if unsure it's best to ask your host.
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