Working notes from React engagements.
September 16, 2026 · CTRLDevs
Streaming is decided by boundary placement, not by adding more of them. How to find the slow segment first, why a boundary around the whole page buys nothing, and the layout-shift and waterfall costs of getting it wrong.
Read moreSeptember 15, 2026 · CTRLDevs
App Router caching changed defaults twice; client cache libraries did not go away. A decision rule for which reads belong on the server, which belong in a client cache, and how to run a mixed codebase without two sources of truth.
Read moreSeptember 14, 2026 · CTRLDevs
Hydration errors have one shape: the server HTML and the first client render disagree. A procedure for locating the disagreement, the five causes that account for most of them, and when suppressing is the correct answer.
Read moreSeptember 14, 2026 · CTRLDevs
A workflow for shrinking a React bundle that starts with a source-map treemap rather than a guess: find the real weight, remove duplicates and barrel-file imports, split at routes, and verify the change in field data.
Read moreSeptember 14, 2026 · CTRLDevs
The React Compiler is stable. A staged adoption sequence: run the lint rule first, compile one directory, measure commits before and after, and leave your existing useMemo calls alone for now.
Read more