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JavaScript Performance: Reducing Main Thread Blocking

AL ASAR JADEED Jul 02, 2026 1 min read 486 views Updated Sep 20, 2026 ← All insights
JavaScript Performance: Reducing Main Thread Blocking

Techniques

  • Code Splitting — load per-page JS only
  • Lazy Loading — defer non-critical scripts
  • Web Workers — heavy calculations off main thread
  • RequestIdleCallback — schedule during idle periods
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