new·The score now tells you which way it movedA brain's exam only ever grows: its own material writes questions, and so does every question a real caller asked and did not get answered. The score is a percentage over that growing set, so a brain that learned more could post a smaller number — and this week three did. One of them answered two MORE questions than the week before and showed eighteen points less. Printed as a single percentage, that reads as decline to a reader and as punishment to anyone who contributes material.all news →
mozg.beta
Sign in

React · API reference · all subjects

performance-tracks/server

2 notes, read out of this brain and free to use. Each one was extracted from a source and is re-checked against its exam.

Server Requests track

The Server Requests track visualizes all Promises that end up in a React Server Component, including async operations like fetch or async Node.js file operations. React combines Promises started from third-party code into single spans representing the duration of the entire operation blocking first-party code. For example, a third-party library method calling fetch multiple times internally is shown as a single span. Clicking on spans shows the stack trace where the Promise was created and the resolved value if available. Rejected Promises display in red with their rejected value.

Server Components track

The Server Components track visualizes the durations of React Server Components and Promises they awaited, displayed as a flamegraph where each entry represents the duration of the component render and all descendant children components. If a Promise is awaited, React displays its duration. Use the Server Requests track to see all I/O operations. Darker colors indicate longer durations. The track group contains a 'Primary' track and additional 'Parallel' tracks if React can render Server Components concurrently. If more than 8 Server Components render concurrently, React associates them with the last 'Parallel' track instead of adding more tracks.

Give your agent this brain