Things That Instantly Make a Web App Feel Slow (Even If It’s Not)

<p>I once audited a page where nearly 40% of the main thread blocking time came from a tag manager firing scripts that the engineering team didn't know were still active.

<p>We browse websites every day, and some feel really nice to use, while others technically work perfectly fine but still start to feel frustrating after a few seconds.</p>

<p>A page that feels instant with a few users can become painfully slow when your business grows. The code hasn’t changed. The server hasn’t changed. The database hasn’t suddenly

<p>There's a rule someone dropped in a product design session that has lived rent-free in my head ever since:</p> <blockquote> <p>"Anything digital shouldn't have more than 7

<p>For weeks, I kept trying to optimize my Angular frontend endlessly.</p> <p>I added:</p> <p>Lazy loading<br /> OnPush<br /> trackBy<br /> Memoization<br /> Bundle