Fast starts before code ships

Most performance problems start with bad defaults.

Rules

• Keep JavaScript budget small.
• Prefer server-rendered HTML.
• Hydrate only interactive islands.
• Measure before and after changes.

Small example

export function budgetLeft(totalKb: number, usedKb: number) {
  return Math.max(totalKb - usedKb, 0);
}

Good article system should make content like this easy to publish and easy to evolve.