Is there any limitation to the number of locations one can add to a Google Map plugin?

Being a new bee, I attempted to provide navigation to 532 Greek Orthodox communities in the U.S. via the nag menu: Region>State>County>Parish. I am almost through this odyssey (which causes an enormous slow down waiting for it to finish drawing the menu system) when I noticed that I could use a single Google map to which I began adding icons. Before I try to create 532 icons that a visitor can zoom down into, I’d like to know if a limitation in the plug-in will ruin a very elegant solution.