Examples: Clean up.

examples/physics_ammo_instancing.html

@@ -152,7 +152,7 @@
 					position.set( 0, Math.random() + 1, 0 );
 					physics.setMeshPosition( spheres, position, index );
 
-				}, 17 );
+				}, 1000 / 60 );
 
 			}