About FPS is less than 10 when loading terrain

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KaiTang KaiTang
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About FPS is less than 10 when loading terrain

Hello everyone,
  FPS remains at 60 at the beginning of loading terrain.When the viewpoint not change,the FPS is getting smaller and smaller,even the value can be 1.When the viewpoint change,the FPS is getting bigger and bigger.
  My program is only read earthfile and load terrain. Terrains are DEM and already create cache.The terrain options is set tile_size = 33, min_tile_range_factor = 64,others are default.