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I am using Lightroom Classic 11.2 on Windows 10 Version 10.0.19042 Build 19042.
I have an NVIDIA GeForce GTX 1660 and I am using the business drivers.
I have Quicktime 7.7.9 (it was the same before I installed Quicktime).
I have a 96 image slideshow with music an animations.
The images are jpegs exported at standard 4K resolutions (height 2160 pixels)
When I run this on my 1920 x 1200 monitor it runs smothly.
When I run this on my 4K TV (as the second monitor on my graphics card) it is very jerky.
I booted into my previous windows installation (same PC) with a version 10 Lightroom install and it runs just fine on either monitor.
I have tried standard and high quality. I have tried music on and off. I have tried blanking and un-blanking the other screen.
Not sure what to try next.
The last time I saw something like this was when I first used lightroom and I didn't have Quicktime installed.
QuickTime on Windows? QuickTime is no longer supported and should be deinstalled.