How to Improve Time to Interactive in Next.js (with Web Workers) | Next.js Optimization Tips #10
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Ever tried to scroll a page and everything just froze?
That’s usually caused by high Total Blocking Time (TBT) - a key performance metric that signals your main thread is too busy to respond to user input.
In this video, we show how to fix this annoying problem in just a few minutes using web workers.
🛠️ You’ll learn:
• What TBT is and why it matters;
• How blocking tasks freezes your UI;
• How to move expensive logic off the main thread;
• A step-by-step guide to implementing a web worker.
🚀 After we fixed the issue, TBT dropped from ~1s to 0s, allowing users to interact with the website or app instantly. This smooth experience boosts satisfaction and encourages repeat visits.
Jakub - / jakub-tarabasz
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