4000x4000 is pumping resourses out the back door as it is non standard and uses the same load as a 4096x4096 map.

Poser 1, 2, 3, 4, 5, 7, P8 and PPro2010, P9 and PP2012, P10 and PP2014 Game Dev
"Do not drive faster then your angel can fly"!