After a hundred posts the chat starts lagging like I'm running cyberpunk and starcitizen at the same time. I don't understand why people use garbage unity for simple visual novels.
I'm not a fan of using Unity for a VN either... but this absolutely is not a VN, and would be damn hard to pull off in Renpy.
if there's an issue with the implementation that causes exponential slowdown as more items are added to the dataset, that's on the dev, not on the app framework.