I have seen other posts related to jerky transitions and lag when presenting with Prezi Classic. I am having this same issue. The other posts address things like
(1) having too many SWF images, but I have none
(2) having too many large images, but I have nothing over 1000 pixels in dimension, and most are only several hundred pixels; I do have a couple movies embedded.
(3) having an old computer, but mine is an iMac with 32 GB RAM and a 3.4 GHz multicore processor, only two years old
Are there any other remedies for this? Some of the transitions in my presentation are so jerky that they make me a little seasick. I guess I could try Prezi Next, but I have already invested so much time in this Prezi Classic presentation, and without the ability to migrate easily from Classic to Next, I feel stuck.