Yeah, i did manage to download it now, thanks!
Like i said, there are more efficient image formats. For example the first image 2lobby.webp, size 423.8 kb. Using simple `magick convert 2lobby.webp 2lobby.avif` reduces image size to 81.5 kb.
About the video issue; please try again, i know at least a dotzend VN using videos succesfully. Reducing quality and stuttering must have been an error on your side, that's not a general problem of neither videoformats nor the stuttering one of Renpy.
If you have any questions to picture or video formats or converting/compression, i'm glad to answer them.