In order to get a good and fast speedrun that will get verified, you need to know the maps. If you don't the maps, there is a big chance that you will be clueless in the run. In order to know the maps, speedrun as much as you can to learn fast. You can also learn certain strategies to take on the ghost. Some strategies are the path you take to search the map or the things you grab when you first go in the house. Combining certain strats together can give you a high performance run.