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The Doherty Threshold says something stupidly simple: Keep response times under 400ms (0.4 seconds). That's it. But 99% of products ignore this and wonder why users bounce. Your product either feels effortless… or like pulling teeth. No in-between.

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Denislav Jeliazkov

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109,431 Aufrufe • vor 1 Jahr •via X (Twitter)

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Denislav Jeliazkovvor 1 Jahr

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:

Profilbild von Denislav Jeliazkov
Denislav Jeliazkovvor 1 Jahr

Perfect example of this in action: Take Linear: Every click is instant. • No loading states • No spinners • No thinking Create project → Add tasks → Assign → Done. The whole flow feels like butter.

Profilbild von Denislav Jeliazkov
Denislav Jeliazkovvor 1 Jahr

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.

Profilbild von Denislav Jeliazkov
Denislav Jeliazkovvor 1 Jahr

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.

Profilbild von Denislav Jeliazkov
Denislav Jeliazkovvor 1 Jahr

Speed isn't the goal here - it's all about finding your FLOW STATE. Every delay breaks concentration. Every lag pulls you out of the zone. Every loading spinner interrupts thinking. 400ms is the difference between flow and frustration.

Profilbild von Denislav Jeliazkov
Denislav Jeliazkovvor 1 Jahr

Most designers obsess over pixels and colors while their app takes 2 seconds to load. Bro, your gradient doesn't matter if users rage quit before they see it. Speed IS design.

Profilbild von Denislav Jeliazkov
Denislav Jeliazkovvor 1 Jahr

Some examples that can tank your products: Form submission: 3 seconds (users think it's broken) Search results: 2+ seconds (they've already left) Page transitions: 1.2 seconds (feels like dial-up) They might all be beautiful UIs. Soon they'd be all dead products.

Profilbild von Denislav Jeliazkov
Denislav Jeliazkovvor 1 Jahr

How to actually fix this: • Optimistic UI updates (show success before server confirms) • Skeleton screens instead of spinners • Preload data before users need it • Cache everything possible Make it FEEL instant even when it's not.

Profilbild von Denislav Jeliazkov
Denislav Jeliazkovvor 1 Jahr

What really gets to me is this: Founders will spend $100k on "beautiful design" but won't invest in performance. Pretty UI with slow interactions = lipstick on a pig. Fast UI with basic design = users will forgive everything.

Profilbild von Denislav Jeliazkov
Denislav Jeliazkovvor 1 Jahr

Bottom line: Everyone obsesses over features, aesthetics, & "innovation." But the Doherty Threshold is the silent killer of products. Your app could cure cancer - but if it takes 2 seconds to load, users will hate it.

Profilbild von Denislav Jeliazkov
Denislav Jeliazkovvor 1 Jahr

Designers: I created a 200-page book of actionable tips and tricks for your everyday design decisions (including psych principles), to help you on your way to becoming a 6-fig designer. It's a no-BS, 100% learn-by-doing approach. Grab it here:

Profilbild von Denislav Jeliazkov
Denislav Jeliazkovvor 1 Jahr

Liked this thread? Give your bro @DenisJeliazkov a follow for more cool design processes & breakdowns. And like/repost to help a fellow designer:

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