event loop
An event loop schedules work and callbacks around the runtime’s execution model.
Use this when One expensive request freezes unrelated interactions or requests.
without the term
“When one user uploads a big CSV, the whole server stops responding to everyone else until it's done. Everything is async, so why does it freeze?”
with the term · How do you ask a model for event loop?
Find what blocks this event loop. Move appropriate CPU work to bounded workers and verify other requests stay responsive under load.
What is event loop?
Node.js and browsers run JavaScript on one thread that takes tasks from a queue. A long synchronous computation blocks every other task until it finishes, even inside an async function.
Why does event loop matter when vibe coding?
An async function can still execute blocking CPU work before or between awaits.
How do you do event loop?
Profile the blocking segment and move or divide it according to the workload.
What goes wrong with event loop?
Replacing synchronous syntax with async syntax while keeping the same blocking computation.