Actually... that scene never took place in the manga. Its just the cover of volume 42. Im amazed they can make a more quality scene with JUST a cover... yet fail to make the rest of the episode enjoyable.

About the encode of the episode... I don't have any trouble running the 1080p nor I have lag. Yet I bought a new computer just 4 months ago, since my previous one died on me (which couldn't even run the Code Geass R2 releases)

I've got...
Studio Hybrid - Intel® Core 2 Duo T8100 (2.1GHz/800Mhz FSB/3MB cache)
4GB Shared Dual Channel DDR2 at 667MHz (2 DIMM)
Intel® Integrated Graphics Media Accelerator X3100

and a 42" HDTV 1080p as monitor...

So yeah...