wei in my experience when 1st few month playing d3 was only shuttering during map change (mean i get red ping once map change for couple of sec) then getting worst time to time when after patch 1.03 till 1.04. i could die at public game when i was like screen freeze during map change. once successful load in i was dead surrounded by mob and elite. got frus and go grab 1 ssd crucial m4 128gb from ronaldjoe. Do a fresh window 7 64bits + optimization using trim and ahci setting.
Hell now im super smooth no more shuttering during map change or lagging in game. Everythings load fast and smooth even with wiz or wd during aoe skills.

yes the video completely same result as mine after changing to ssd. usually starting few sec after load map will jerking abit but you dont get this when you on ssd.