Look at these 2 UIs. One of them will 100% outperform the other for one reason: The Doherty Threshold. Here's how this psychological principle works & how to use it in your products:

Jira, on the other hand? It’s like trying to sprint in molasses. • Complex flows • Slow page loads • Useless animations to hide the slowness By the time you create a task, you forget why you opened it.

Here's the psychology behind it: When interactions happen under 400ms, your brain perceives them as instant. Above 400ms? Your brain notices the delay. And once you notice it, you can't un-notice it.