Quote from NathanyelYou probably found that out by yourself by now, but yes. That's what the "Cached" in the minimap button tooltip means.
Yeah, wish there was a way to force clearing the cache :-)
Quote from TinfaceThe first time you get within (visual?) range of a mob, info about the mob is retrieved from the server and stored locally in the cache. SilverDragon detects this and notifies you about it.