""Curiouser and curiouser" said Alice." From 'Alice in Wonderland'.
I seem to be in a sort of Wonderland myself! I have eventually found a solution to the stuttering during transitions and zooming on my Shuttle SZ77R5 computer. Nothing to do with the graphics card, driver, cpu, etc,etc; but due to the lack of Apple's Quicktime!! Installing Quicktime 7.7.79 cures the stuttering in LR CC, and uninstalling it causes LR to stutter again.
Now I understand that Quicktime has been necessary in the past for running some videos in LR, but I haven't read anything about it being necessary for running a live slideshow from jpgs already resized for the screen. And even more curious is the fact that I don't have Quicktime on my main desktop where the slideshow runs fine without any stuttering!!
Anyone any ideas on why this is happening?
A still puzzled yet happy Bob Frost
Quicktime also cured the stuttering of transitions and zooming in the slideshow on my new Dell XPS13 laptop.
But from the total lack of responses, either everyone else knew this, or no-one knows why?
I have now had a partial answer to this problem.
According to an Adobe source, "We don¹t require QuickTime.
In some circumstances, we leverage QuickTime if its there. In this case,
its likely that QT has a path that is more optimized, thus we're
leveraging it to reduce the stutter."
So if you have any problems with LRs slideshow stuttering in transitions or zooming/panning, install Quicktime.