In case someone have the videos/animations +/- stuttering in Isabella Chasing Shadows, it's usually a common issue from renpy 8.0.3 (from what i understand Isabella run on this version of renpy) or 8.1.0 on some older CPU.
But you can get rid of the problem by downloading the file from this post from gojira667 :
https://f95zone.to/threads/ripples-v0-5-0-public-jestur.56110/post-9001769
download the file "renpy-8.0.3-noSDKs-mmx.zip" from either the pixeldrain or mega on his post.
then open the downloaded "renpy-8.0.3-noSDKs-mmx.zip"
Take the folder "py3-windows-x86_64" located in the ...\renpy-8.0.3-noSDKs-mmx.zip\renpy-8.0.3-noSDKs-mmx\lib\
then move that "py3-windows-x86_64" folder into ...\YourIseballaChasingShadow\lib\
accept replacement of files of the same name.
Start the game and notice videos will not stutter anymore and will play smoothly.
But you can get rid of the problem by downloading the file from this post from gojira667 :
https://f95zone.to/threads/ripples-v0-5-0-public-jestur.56110/post-9001769
download the file "renpy-8.0.3-noSDKs-mmx.zip" from either the pixeldrain or mega on his post.
then open the downloaded "renpy-8.0.3-noSDKs-mmx.zip"
Take the folder "py3-windows-x86_64" located in the ...\renpy-8.0.3-noSDKs-mmx.zip\renpy-8.0.3-noSDKs-mmx\lib\
then move that "py3-windows-x86_64" folder into ...\YourIseballaChasingShadow\lib\
accept replacement of files of the same name.
Start the game and notice videos will not stutter anymore and will play smoothly.