Multisampled envmaps for warp effect rendering. Open screenshots in a new tab to see difference.

Off:

4xMSAA:

32xMSAA:

Make sure you have very powerful GPU to use in 32x. My GTX 780 gives just 50 FPS in this scene, and 90 FPS in 2-way SLI (yes I made SE compatible with SLI... almost).