KML is very inefficient for polygons and larger datasets, especially if you put everything to one file and put it offline. You should use custom format and add polygons to only currently visible area, so you have less than 10 polygons to be shown in a time.
Another option would be to use server-side rendering for your data.
KML is very inefficient for polygons and larger datasets, especially if you put everything to one file and put it offline. You should use custom format and add polygons to only currently visible area, so you have less than 10 polygons to be shown in a time.
Another option would be to use server-side rendering for your data.
/JaakL