I didn't want to get into complex solutioning as Rseding and other developers at Wube have demonstrated extraordinary skillsets and success in this area. I still would like this suggesting to be the simple idea of increasing the basic number of attempts per tick. I know that strikes most developers...

Instead of having a queue of ghosts, it might be better to have a queue of (chunk, building_type) pairs, with each pair holding a list of ghosts that can be built of that type in a given chunk. For instance, instead of 1024 concrete ghosts, have an entry for concrete in a specific chunk. If there ar...