Root cause is that startup path is more crowded these days with JIT, dynamic linking, app initialization, filesystem/DB scans, sandbox initialization, subprocesses, etc. It's a natural consequence of the apps (or underlying frameworks) growing in size and complexity. Optimizing it all by hand is unreasonably expensive if not impossible.

What we need instead is a way to persist the process or even whole sandbox to disk and then fork off new instances from that. That's much less work and much more effective than piecemeal optimizations (AOT, native code, etc.). Unfortunately, existing platforms and frameworks do not support forking, let alone forking from persisted app image.