MPEG 2 HD vs. MPEG 4 HD

I have yet to flash the unit with the new software but I have it up and running out of the box.
I use a 1 gig switch and VLC on a computer with an Intel I7 cpu.
The MOI seems to work well with Standard Definition MPEG2 and MPEG4, however in High Definition, only MPEG2 is problem free. I find the MPEG4 HD that carries 1080i content causes the picture to stutter. Would that be a limitation of the processor of the MOI or the 10/100 connection of the MOI?
I use a 1 gig switch and VLC on a computer with an Intel I7 cpu.
The MOI seems to work well with Standard Definition MPEG2 and MPEG4, however in High Definition, only MPEG2 is problem free. I find the MPEG4 HD that carries 1080i content causes the picture to stutter. Would that be a limitation of the processor of the MOI or the 10/100 connection of the MOI?