My IDE is too heavy so I moved to Emacs
As an emacs user I have to say that IntelliJ (and pretty much any modern IDE) feels snappier than emacs configured to do anything comparable (lsp-mode/eglot, corfu/company, tree-sitter etc).While IDEs may require more resources, they usually utilize them better.Emacs is fundamentally single-threaded and not great at async things. With most of the logic written in a very slow non-JIT friendly language with naive blocking GC. Rendering pipeline is also a mess. Underlying internal datastructures are also very naive (which is a good thing when you implement things in C).Things are slowly changing. emacs now is a lot better than 5 years. So may be in 10 years it will really rival more modern competitors in terms of performance.Having said all this, emacs universality and extensibility keep me with it.