Why does primary ecological succession take place slowly?

I would assume the cause would be because organisms are growing almost from scratch. They lack many resources needed for survival and thus the changes occur slowly. The life forms also tend to be simple, such as plants.

Are you asking about a street map usage  if so here is your answer  a street map for a very limited area could simply be a bit map or a .jpg image.  but a more general map would probably store the streets as vectors.  but you shouldn't assume that there is one way to do it