Anyone got a full save, seem my old saves cause the animation to have major frame rate drops and before anyway ask I'm on a GTX 1070 with AMD Ryzen 7 and 16GB of DDR4 so its not my computer.
The base engine is RPG Maker MV so saves have nothing to do with the animation and frame rate. The game engine simply calls out specific files to play videos and overlays. There is actually a problem with the scripting of the animations in the translated version provided here.
There are specific scripts for transitions that don't 'play well' when translated which cause the stuttering. You don't see is in the base version because the engine properly recognizes all the intermediary scripts to slow or pause player model animations and transition between movie files and text. It doesn't break the game per-say, but if the script to stop one video isn't properly handled during a loop the files will clash and create the stuttering until one file ends and the one playing is the last one there.
Also, if you're using a compressed version to save space you're going to run into problems with those video files for obvious reasons if the underlying scripts and timing isn't handled properly to deal with the compression (which they aren't currently).
I've broken my game a few times trying to do a batch MTL of the game where the file points and scripts get translated by mistaken. Then I realized I really REALLY suck at this.
If it help, the problem probably has to do with how the MP_Loop, MP_Video, and MP_Movie scripts are handled. MP_Loops deals with the looping animation video and I 'think' when triggered it starts and stops how the animation files are played to stop the loop and an 'ending' animation before starting the loop on the next one. MP_Video and MP_Movie seem similar, but I get the feeling MP_Video deals with the overlay animations and MP_Movie deals with the underlying file playing. However, I can't tell since I'm using a MTL.
Example: MP_Video would handle the side panel animations and sync them with the main thrusting animation so when the MP_Movie goes to climax it end the previous thrusting sidepanel animation and goes to the climax animation.