Widget Animation jerks while playing in game

Hi everyone, The problem I’m running into is, that I animated what essential is a “slideshow” as an information part of an application.
I animated the whole thing within a Widget Blueprint.
But for some reason when it plays within the app it looks like the frame rate is very low but the FPS counter doesn’t indicate such a problem.
Would be great if someone got an idea of where this might come from :D.

Any chance that you managed to solve this? Encountering the same issue in 5.3.2