ecode can handle big files, though it's not specifically designed for that. I just tested it with the largest text file I could find (760MB), and it worked just fine (searches included). The editor is designed with performance in mind, taking a similar approach to Zed (custom GPU-accelerated renderer, fully native C++ code, heavily multi-threaded, etc.). The biggest challenge is forming a community of collaborators, solo developing such a project in my free time is a huge task. So if anyone is interested, please contact me =)