Why RenderTexture very slow on SGS2 and fast on KINDLE?

I created empty scene with TextureRenderer and camera
it takes always 13ms on SGS2 and only 0,09ms on KINLDE

is it possible fix on sgs2? or its just device is too old?

you mean RenderTexture.SetActive? We know about the issue and know how to fix. It should be out in 4.2

yep, thanks!