Performance | Alexis Hope

LATEST MAY 1, 2026

Tail Call Optimisation in Haskell and JavaScript

#Haskell#JavaScript#TypeScript#FunctionalProgramming#GHC

A tail call is a function call that is the last thing a function does before returning. That sounds like a minor implementation detail. It isn’t. Whether a runtime honours tail calls — replacing the current stack frame rather than pushing a new one — is the difference between …

Nim's Garbage Collection — From Automatic to None

#Nim#GarbageCollection#ARC#ORC#Systems

One of the things that drew me to Nim is the degree of control it offers over memory management without forcing you to the extreme of a borrow checker. The default experience is a garbage-collected language that feels like Python. The far end of the dial is manual memory …

Responsive Images in HTML

#HTML#Images#Performance#SEO#Cloudinary

A single <img src="hero.jpg"> used to be the only option. It still works — but it means serving a 2400px image to a device with a 375px screen, and serving that same image as a JPEG to a browser that would have accepted AVIF at a third of the file size. The browser has had the …