All based on zoom level 14 tiles, on each commit modified tiles are generated. The latest tiles for each commit are then picked up for vector tiling and route planning.
Usually there are just a few modified tiles in a scenario. This results in almost instant updates between and edit and the map and routes changing.
Route planner also tile based, it can change it's routing graph by loading modified tiles. Also could be used for an always up-to-date route planner on live OSM data.