Website Speed Optimization Services

Projects we are most often asked to build.

Core Web Vitals audit and fix

Diagnosis of LCP, INP and CLS from field and lab data, with a prioritized fix list executed on the site.

WordPress speed optimization

Caching, image optimization, plugin audits, database cleanup, theme fixes and managed hosting migration; see WordPress maintenance services.

Shopify and ecommerce speed optimization

Theme and app audits, image and script fixes, third-party tag control; see Shopify agency.

React, Next.js and JavaScript app performance

Bundle analysis, code splitting, rendering strategy, Server Components, hydration and third-party script control; see front-end development.

Hosting, caching and CDN setup

Cloudflare configuration, server caching, HTTP/2 and HTTP/3, compression, edge rules and hosting changes.

Performance monitoring

Real-user monitoring and alerts so regressions are caught after every release.

Cloudflare configuration, server caching, HTTP/2 and HTTP/3, compression, edge rules and hosting changes.

Key features and components

What separates a useful build from a costly one.

Website speed optimization: key components
Feature	Why it matters
Field-data driven	Fixes that move Google’s metrics
Image and video optimization	Largest single gain on most sites
Script and tag governance	Third parties under control
Font and CSS optimization	Faster first paint
Caching and CDN	Fast everywhere
Server response time	Hosting and backend fixes
Layout stability	No shifting content
Monitoring	Regressions caught

Common integrations

Where the value usually comes from.

Common integrations
System	What we connect
Measurement	Search Console, CrUX, PageSpeed Insights, WebPageTest, Lighthouse
CDN and edge	Cloudflare
Platforms	WordPress, Shopify, Webflow, Next.js
Images	WebP/AVIF, responsive sizes, lazy loading
Monitoring	Real-user monitoring, Sentry, SpeedCurve
Tags	Google Tag Manager, server-side tagging

Measurement standards

Speed claims are verified in field data, not screenshots of a lab score.

Targets are the Core Web Vitals thresholds at the 75th percentile of real users on mobile.
Before-and-after figures come from CrUX and Search Console over a full 28-day window.
Lab testing uses WebPageTest and Lighthouse to diagnose, never as the sole success measure.
Changes are made on staging with regression checks for forms, tracking and layout.

How we deliver website speed optimization — Field data from real users, not a single lab score, is what Google uses; fixes are prioritized by what moves it.

Our website speed optimization process

We measure field and lab data, diagnose the bottlenecks, fix media, code and delivery in priority order on staging, deploy, and re-measure over a full reporting window, then monitor for regressions.

How much does website speed optimization cost?

As US planning figures: a Core Web Vitals audit $1,000-$3,000; audit and fixes for a business site $2,000-$15,000; larger stores and applications $10,000-$40,000; ongoing monitoring $200-$1,000 a month.

Website speed optimization cost ranges (planning figures)
Scope	Typical range	Timeline
Core Web Vitals audit	$1,000-$3,000	1 week
Audit and fixes, business site	$2,000-$15,000	2-4 weeks
Store or application performance project	$10,000-$40,000	4-8 weeks
Performance monitoring	$200-$1,000 per month	Monthly

Technology we typically use

Mainstream, maintainable choices.

Technology we typically use
Layer	Choice
Measurement	CrUX, Search Console, WebPageTest
Edge	Cloudflare caching and rules
Images	AVIF/WebP pipelines
Code	Bundle analysis, code splitting
Hosting	Managed WordPress, Vercel, AWS
Monitoring	RUM, alerts

Mistakes to avoid

Common causes of overruns and low adoption.

Chasing a lab score instead of field data.
Installing another optimization plugin on top of the problem.
Ignoring third-party scripts added by marketing.
Optimizing the homepage only.
Fixing speed on hosting that cannot deliver it.
No monitoring, so the next release undoes the work.

Prioritized — Fast. Impact over effort..

Why choose Progression Agency for website speed optimization?

Engineering, design and go-to-market in one team.

Engineers who build sites fix them, on WordPress, Shopify, Webflow and Next.js.
Verified in Google’s field data over a full reporting window.
Hosting, security and maintenance in the same team if the cause is deeper.
You own the code, data and accounts.
Headquartered in New York City, working with clients nationwide and worldwide.

See website security services, WordPress hosting guide, hosting types compared and why is my website not getting traffic.

Ready to scope it?

Tell us the users, workflow and systems involved. We will propose a first release and planning estimate.

Get a proposal

Getting found in search

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Websites and design

Choosing and working with an agency

Software and app development

Web development, platforms and hosting

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By industry and by situation

Frequently asked questions

What are website speed optimization services?

Technical work that measures and improves how fast a site loads and responds for real users, verified in Core Web Vitals.

What are Core Web Vitals?

Google’s page experience metrics: Largest Contentful Paint (2.5s), Interaction to Next Paint (200ms) and Cumulative Layout Shift (0.1).

Does site speed affect SEO?

Yes; Core Web Vitals are a ranking signal and speed affects crawling, bounce and conversion.

How much does speed optimization cost?

$2,000-$15,000 for a business site, more for stores and applications, as planning figures.

How long does it take?

Two to four weeks for most sites, plus a 28-day window to verify field data.

Can you speed up a WordPress site?

Yes; caching, images, plugins, theme fixes and hosting are the usual levers.

Can you speed up a Shopify store?

Yes; theme code, apps and third-party scripts are the usual causes.

Can you speed up a React or Next.js app?

Yes; bundles, rendering strategy and third-party scripts.

What is a good PageSpeed score?

Lab scores vary; the goal is passing Core Web Vitals in field data at the 75th percentile.

Why is my site slow?

Usually oversized images, too many scripts, render-blocking resources, weak hosting or no caching.

Do you change hosting?

When hosting is the bottleneck, yes, to managed WordPress hosting, Vercel or Cloudflare.

Will optimization break my site?

Changes are made on staging and tested; forms, tracking and layout are checked.

Do you monitor after the fixes?

Yes, with real-user monitoring and alerts.

What is INP?

Interaction to Next Paint, the responsiveness metric that replaced First Input Delay in 2024.

Where is Progression Agency located?

New York City, serving clients nationwide.

How do I start?

Share the URL; we return a Core Web Vitals summary and proposal.

What are Google’s Core Web Vitals?

Googles Core Web Vitals are three field metrics Google uses as a ranking signal: Largest Contentful Paint (loading), Interaction to Next Paint (responsiveness) and Cumulative Layout Shift (visual stability). What is Core Web Vitals in practice: how the site feels to real users on real devices, measured from Chrome.

How do I run a Core Web Vitals test?

A Core Web Vitals test starts with PageSpeed Insights, which shows field data from real Chrome users and a lab run; Search Console’s Core Web Vitals report lists which URLs fail. Google Core Web Vitals thresholds are 2.5 seconds for LCP, 200 milliseconds for INP and 0.1 for CLS, at the 75th percentile.

Planning an app?We design, build, launch and maintain iOS, Android and web apps, with a written scope before any code.

Get an app proposal

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Tell us what you are trying to grow and we will come back with a plan, not a pitch deck. Same-day reply on weekdays.

Website Speed Optimization Services | Core Web Vitals, Page Speed and Performance Fixes

What are website speed optimization services?