Slow Loading

Hi,

First of all, great plugin simple and efficent! Great job!

I added my marks and placed map in one of my page using shortcodes. Everything was ok but then when i was trying to browse page, map is loaded really really slow. I did not use any cache plugin, my internet connection is fine too. Any solution for this?

https://ww.wp.xz.cn/plugins/wp-google-map-plugin/