diff --git a/vendor/clouds3d.js b/vendor/clouds3d.js
index 89e25bb..3ed57be 100644
--- a/vendor/clouds3d.js
+++ b/vendor/clouds3d.js
@@ -270,11 +270,11 @@ function init(canvas) {
 var GROUND_TILE_URL = 'https://server.arcgisonline.com/ArcGIS/rest/services/World_Imagery/MapServer/tile/';
 var GROUND_TILE_Z = 11;
 var GROUND_TILE_SIZE = 256;
-var GROUND_MOSAIC_SIZE = 16;    // 16x16 tiles around the camera
+var GROUND_MOSAIC_SIZE = 9;     // 9x9 tiles around the camera (~81 tiles, fast initial load)
 var GROUND_BUFFER_TILES = 2;     // refetch when this close to edge
 // Passau tile at zoom 11
-var GROUND_BASE_X = 1102;
-var GROUND_BASE_Y = 710;
+var GROUND_BASE_X = 1099;
+var GROUND_BASE_Y = 706;
 
 // Module-level state, shared across renderer instances
 var groundCanvas = null;