On Mac, go to Google Earth > Preferences > 3D View. On Windows, go to Tools > Options > 3D View. On Mac, go to Google Earth > Preferences > Cache > Clear disk cache. You can use QGIS to open a KML file then apply a simplify algorithm on the polygon. On Windows, go to Tools > Options > Cache > Clear disk cache. Such geometries would need to be simplified and the number of points reduced. Size of the KML file and number of features is not the only issue to consider. A KML file with a single hi-res polygon having 350K points and 7000 inner holes can cause Google Earth performance issues. Number of Points per feature and geometry simplification This is used when the content is mutually exclusive and only one set of features should appear at any given time. Here's a radio folder example allowing the user to only choose one of the NetworkLinks at a time. You can further restrict what is displayed at a given time using radio folders. Here is the structure of the root KML file: This will prevent all the data from being displayed all at once. kml file can reference all the sub-KML files, but the referenced sub-files should have the visibility off so the user must manually check it to be visible.
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