the image just might be unity's texture glitching out thing - i wouldn't be able to really know without seeing it, and even then i probably wouldn't know lmao
unity automatically converts the vids codecs & i asked the other programmer who worked on this with me & he said it should be okay
as far as performance - we only have 1 thing stuffed into an update function, so there isn't a lot that's being constantly checked for in every frame & everything else is event based
however, i do use a particle system in unity's native features, and that can cause a lot of performance lag; my own laptop is shit and ran heavy when i first introduced it until i cut it down and optimized it a little lmao, so that might be why your pc is angry
dondon did a beautiful video!! it made me a cry a lil lmao cause he went through all the endings & analyzed them and the story in the exact way that i wanted the story to present itself <33
i had pre-existing knowledge of unity & C# and my partner (the other programmer) is a professional game dev for unity, whereas neither of us know renpy or light.vn. & since i only had a month to make this game, i didn't trust myself to learn a new engine alongside creating the game i had a specific vision for!