Why Heavy IDEs Drain Your Laptop: A Real‑World Comparison of IntelliJ and Emacs
The author recounts personal experiences using heavyweight IDEs like IntelliJ on modest laptops, highlighting issues such as overheating, fan noise, and rapid battery drain, then compares these drawbacks with the lightweight Emacs editor, presenting battery‑usage screenshots and discussing trade‑offs and alternatives.
My Problem
IDE (Integrated Development Environment) is a great tool that makes developers' lives easier, but on older or low‑end laptops it can become a burden. I ran IntelliJ IDEA Community Edition on a 2019 MacBook Air and on a Dell XPS 13 with Linux, and both machines became extremely hot, the fans grew noisy, and indexing operations took a minute or more.
The issues are unrelated to the programming language stack—I experienced similar slowdowns with Java, Groovy, Dart, Kotlin, and others.
IntelliJ Alternatives
JetBrains is developing Fleet, a lighter editor that shares the same backend as IntelliJ, but on my laptop it still feels heavy. Eclipse, which I had to install to configure Java projects, also feels clunky and forces undesirable code formatting.
Emacs to the Rescue?!
I turned to Emacs, a legendary text editor that now provides full IDE features via LSP. Emacs is lightweight, highly extensible, and offers powerful tools such as Magit for Git and Org mode for note‑taking. However, it requires initial configuration and some familiarity with Emacs Lisp.
With Emacs I have configured modern keybindings and support for many languages (Java, Go, C, Rust, Dart, Groovy, Common Lisp, Zig, etc.), including auto‑completion, inline documentation, code navigation, and one‑click test runners.
Is Emacs Really Lighter?
To answer this I recorded battery usage over a 24‑hour weekend. While coding in IntelliJ the battery curve drops sharply and the laptop quickly overheats; using Emacs the battery drains slowly and the device stays cool.
Final Thoughts
Emacs is far lighter than any modern IDE while still offering essential features. I hope JetBrains hears this feedback; perhaps Fleet will become the solution. For now, Emacs remains my preferred tool for non‑professional work despite its occasional rough edges.
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