I never tested the High Resolution textures because it was recommended to have a pretty hefty PC to enable it, but now I found these benchmarks stating there isn't any performance hit when enabling it: http://www.tomshardware.com/reviews/crysis-2-directx-11-performance,2983-7.html

What's your experience? I won't be on my PC until next Monday to test it.

There is no performance hit.It needs more Vram.1GB or less may casue stuttering at HD res.