Prop map perftweaks

@aesnyder 
@cthrax 
@kandizzy 
@gitnik 
@zacronos 

These are O(n) to O(1) perf fixes in the way that PropMap is used. This bumps up some speed in markers and clustering markers. I wanted to tweak PropMap before I go ahead replace the clustering logic.
lol, yeah thats due to shortcuts to the terminal