Try this, it works in most cases

1- Fisrt enable internal tiling with the command 

gdal_translate -co "TILED=YES" original.tif tiled.tif 

2-than add overviews 

gdaladdo -r average 2 4 8 16 32 64 128 

3-create a tileindex 

gdaltindex myindex.shp *.tif 

4-than create a spatial index 

shptree myindex.shp 

and finally add the layer to the map 

LAYER 
  NAME myorthos 
  TYPE RASTER 
  DUMP TRUE 
  STATUS ON 
  TILEINDEX ../data/myindex 
  TILEITEM Location 

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