Can the extension process and load the page with 1000+ locations?
The map will load in less than 3 seconds, even if there are more than 30.000+ locations. However, it is important to note that we were testing this behavior in our local environment, and we can’t guarantee the same performance in your store.
Also, we would recommend using the ‘Number of Locations on a Page’ feature. The option defines the number of locations on one page and allows you to split the list of locations into several pages. That helps to load the whole page faster because the program doesn't need to calculate the distance to all the points, only to several, which is important, when a website has a wide range of locations.
See more details on Store Locator page