# Performance overhaul of Shiftly web app

> Took a sluggish single-page app from failing to passing Core Web Vitals on every key page.

URL: https://freelance.adscaled.media/freelancers/pedro-alves/work/performance-overhaul-of-shiftly-web-app

Took a sluggish single-page app from failing to passing Core Web Vitals on every key page. A case study by Pedro Alves, Junior Frontend Developer (React).

## Challenge

The search results page of Shiftly, a workforce scheduling app, took over five seconds to become interactive on mid-range phones. Organic traffic had started dropping after the page experience update, and bounce rates were climbing.

## Solution

I profiled the app, split the bundle by route, replaced two heavy libraries with small utilities, moved images to responsive formats and rendered the first results on the server. A performance budget in CI now fails any pull request that makes things slower.

[View Pedro Alves’s profile](https://freelance.adscaled.media/freelancers/pedro-alves)

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