проблема в Stage3D и ей уже не первый год. Stage3D всегда делает mipmaps

Та ладно!

Jeff POSTED 2 MONTHS AGO:
One important factor to keep in mind is that even if you ask Starling not to generate mipmaps for your texture (which is a good thing when you don't need them as it avoids having Starling make more bitmaps during the loading), Stage3D currently *always* allocates memory space for mipmaps for all textures. So expect 1.333% actual memory use of the base 32-bit memory allocation for the texture memory.

See:
http://forum.starling-framework.org/top ... post-10621

Jeff POSTED 11 MONTHS AGO:
There it incorrectly talks about saving texture memory by turning off mipmaps, but then fails to mention the one 'performance benefit' of faster loading times by avoiding the scaling and uploading of mipmap versions if you do choose to turn this off with Starling.