During a quick test, DTTG showed me pre-existing tags after I had typed the third letter; it takes up to approx. a second to do so, though. The behaviour isn’t as I had expected, though - I also get tags shown which aren’t obviously related (as subject matter goes, they are related - but not technically); also, in the following example, if I type a fourth or fifth letter and then delete that/those letters, going back to three letters, the tag suggestions change. I’m not sure this is intended behaviour (but I’m also not sure it is related to your query) - does DTTG use some form of AI to guess relevant tags?