As for null-frames, it is a feature of the AVI, and it just tells the software to use the previous frame, whether compressed or not. So it should work with any codec.
The codec uses SSE2 only. SSE2 is nice, as almost any CPU commonly in use nowadays support that.
The next logical option would be to use AVX. I would skip anything between SSE2 and AVX. AVX might give some speed increase, but not much.
Another interesting path would be Kaveri, but I guess it's not widely popular yet.
Greets,
I.
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