Decoding of 1080i programs takes more work by either you graphics card and/or by your software decoder package then do 720p programs since no de-interlacing or motion compensation work is required with 720p programs. And if you rdecoder or graphics card can't keep up with the input data rate then frames will be dropped and stuttering can occur when too many frames are being dropped.
Easy test - try the 720p version, if it works fine but you get stuttering with the 1080p version then your equipment is not up to the task. At a glance, it doesn't look like your processor has the juice
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