Map takes ~20 seconds to load

[MikeWarren2014]

This issue was first brought up on CodeReview, but to save some clicking, I give brief recap of the issue:

The map, from entering the URL, to adding the markers, recentering the map, and setting zoom, takes about 20 seconds to load. There's 101 markers to load, each with their own hover listener and click listener.

[MikeWarren2014]

I may need to write function that calls setTimeout(addPotholeMarkers(...), someTime, with the same signature as addPotholeMarkers, where someTime is a static number that is incremented on each call of the function.