Improve map frontend performance

[orblivion]

I have had cases where a map was super slow to zoom. However it might have had something to do with an old version of the map render that no longer exists. It also might have had something to do with the number of markers I had. See if lots of markers makes it super slow?

Separate from that though - when I try Protomaps on a different site it often seems way smoother than even the best case for Share-A-Map. I should play around and see what I might be doing to slow things down so much. My front end code isn't very good as of this writing so there's probably lots of optimizations to do.