Most hand-drawn film animation is done at 12fps, with direct-to-video animation at 10 or 15fps. But, some really cheap (i.e., bad) animation was at 8fps (film) or 6fps (NTSC video).
I understand, but as I mentioned, Panasonic 58EX700 somehow manages to play that videos… Isn’t strength of a player also defined by ability to play badly encoded files? 
How can I crop the video to provide you a sample?
Did you try as I suggested and turn off hardware decoding?
How to create a sample:
Download and install mkvtoolnix to your pc: https://mkvtoolnix.download/
Drag and drop the file you want to take a sample of into the input gui window
Switch to the output tab
You’ll find split mode and its options there ( by size or duration, its pretty simple)
Optionally you can also deselect audio and other strings in the Input gui window to reduce size of the sample ( but video has to stay selected of course )
considering the hw decoder struggles sw will just melt under the load I think.
Not yet, I will try that later today.
Here’s a 2 minute sample:
To be honest: This sample stutters here even using VLC on a i7-8850H … ?
Strange, it plays fine on my old i5 laptop.
According to your advice I disabled Sync Playback to Display - no change.
With software decoding its even worse.
I’m wondering how Apple TV 4K is gonna handle that - is anyone able to check?
Answering my own question: ATV 4K plays without stuttering those badly encoded files.
Enjoy your bad encodes 
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Hmm… No. There are specs for video encoding, specs that are also followed by manufacturers to build hardware.
Devs here help in any way they can (the code already contains lots of workarounds to fix specific manufacturers or even models bugs) but out of spec files are to be avoided.