I've been noticing that, while Quantum Fabricator has been quick to satisfy upgrade requests, construction requests tend to take a pretty long time. I took a look at storage.tracked_requests.revivals and found thousands of requests for entity-ghosts on Castra. Castra has player-like enemies that can build defences akin to the player, and following one of the requests led to a spot where there used to be a wall controlled by the enemy force (that I've long-since blew up with landmines). Since my own ghosts would be mixed in with the same requests, and Quantum Fabricator only processes so many requests at a time, these enemy ghosts are likely responsible for Quantum Fabricator's very slow construction time.
Either processing requests for different forces separately, or just completely ignoring non-player forces would resolve the long delay, though the latter would only really work in non-PvP scenarios.
