It's not mature yet, but xi can apparently already handle files of several hundred MB with no tearing or lag at all: https://github.com/google/xi-editor https:/

It's not mature yet, but xi can apparently already handle files of several hundred MB with no tearing or lag at all: https://github.com/google/xi-editor https://github.com/google/xi-editor. It completely separates the (Rust) back-end process that manages the whole file from the front-end windows, which only render the on-screen sections.