When QuintoAndar improved its Interaction to Next Paint (INP) by 80% and saw a 36% rise in conversions, it wasn’t just another web.dev success story - it was a sign of where performance is heading.

UX and speed are no longer separate goals. They are the same conversation. And when you look closely at the methods QuintoAndar used - async yielding, React transitions, removing heavy scripts - you start to see the blueprint for what next-generation optimizers like INProve already automate.

Let’s unpack what this means.

INP isn’t just about code - it’s about control

QuintoAndar’s team found themselves fighting against something every modern website experiences: main-thread overload.
Dozens of scripts competing for attention, interactions waiting behind long tasks, and the browser struggling to keep up with user intent.

Their approach - breaking up tasks, prioritizing rendering, simplifying the thread - reflects a deep truth:
INP isn’t about speed alone; it’s about giving control back to the user.

When you make that click respond instantly, the interface feels alive. And that’s where real engagement happens.

What they did manually, INProve does automatically

In QuintoAndar’s story, we saw a technical toolkit come together:

• Async/await to yield back control to the main thread

• React transitions to avoid blocking updates

• Debouncing and memoization to smooth input handling

• Removing third-party noise and optimizing rendering paths

Each of these tactics reduces input delay - the silent killer of responsiveness.
But implementing and maintaining these optimizations across an evolving site is hard work. That’s why we built INProve to handle that complexity automatically.

INProve continuously monitors real user interactions, detects long main-thread tasks, and yields them intelligently - ensuring the page remains responsive, no matter what framework or setup a site uses.

Where QuintoAndar fine-tuned responsiveness through manual engineering, INProve does it effortlessly for you. It observes real-world interaction data and adjusts dynamically, optimizing for responsiveness without touching source code.

Removing noise is as powerful as adding speed

One of the biggest wins from QuintoAndar’s performance journey was not a new feature - it was removal.
They eliminated unnecessary third-party pixels, cut down on CSS-in-JS overhead, and simplified rendering.

That’s something we see constantly in performance data:
Speed gains often come from subtraction, not addition.

INProve approaches this automatically, too - identifying scripts, render paths, and long-running tasks that degrade interactivity and deprioritizing them in real time. Instead of asking teams to audit their bundle by hand, the optimizer treats this as a living system, where priorities can shift dynamically based on what users actually do.

From performance projects to performance systems

The real takeaway from QuintoAndar’s case isn’t just that INP matters - it’s that sustainable speed requires governance.
They built alerting, thresholds, and release checks to prevent regressions. That’s a level of performance maturity that most organizations aspire to but rarely maintain.

And this is exactly the direction we see the industry moving:
from one-time performance efforts to continuous, autonomous systems that monitor, adapt, and optimize.

Why this matters for everyone

QuintoAndar’s 36% conversion lift wasn’t magic - it was the tangible result of removing friction between user intent and response.

That kind of improvement is universal.
Whether you’re a marketplace, a SaaS platform, or an eCommerce store, faster interaction equals stronger engagement and higher retention.

INProve makes those same interaction-time optimizations available to everyone, instantly.
No refactors. No code rewrites.

Uxify’s perspective

At Uxify, we see QuintoAndar’s journey as a proof point for a much larger shift:
performance engineering is becoming adaptive, data-driven, and eventually - autonomous.

The techniques that once required weeks of developer time are now embedded in INProve, available to any site that cares about responsiveness and user experience.

Because in the end, great performance shouldn’t be reserved for companies with dedicated teams and months to spare.
It should be the baseline - for everyone.