Web Performance Optimisation

Performance work only counts when the numbers move. We profile the application as it actually runs, fix what the measurements point at rather than what feels slow, and re-measure — on the frontend, the backend, and the queries underneath both.

What this includes

Core Web Vitals

Largest Contentful Paint, Interaction to Next Paint and Cumulative Layout Shift. These are ranking signals as well as user-experience signals, so the work pays twice.

React render performance

Finding the renders that should not be happening, the lists that should be virtualised, and the bundles that should be split — with profiling data behind each change.

Backend and query optimisation

Reworking algorithms to cut processing time and resource consumption, and fixing the query patterns that quietly dominate response time.

A written performance baseline

You get the before numbers, the after numbers, and what changed between them. Without a baseline, performance work is unfalsifiable.

Numbers

  • 30%platform performance increase, measured
  • 3layers profiled: browser, server, database
  • 100%of changes backed by before-and-after numbers

Evidence

A React and Node.js platform we optimised recorded a 30% increase in platform performance alongside higher user engagement; separate engagements reduced system downtime and cut algorithmic processing cost.

Tech stackReact · Next.js · Node.js · Core Web Vitals · Jest · Cypress

Common questions

How do you decide what to fix first?
By measurement, not intuition. Profiling almost always finds that a small number of causes dominate, and that the code everybody assumed was slow is not one of them.
Will performance work improve our search ranking?
Core Web Vitals are part of Google's page experience signals, so yes — but they are a tiebreaker, not a substitute for content that matches what people search for. We will tell you which of the two is actually your constraint.
Can you do a one-off audit rather than an engagement?
Yes. An audit delivers a prioritised, measured list of problems with estimated effort against each, and it is yours to implement with or without us.
Web Performance & Core Web Vitals Optimisation | alien-dev