Pass Core Web Vitals, score 90+ on Lighthouse, and recover lost rankings. LCP, CLS and INP fixes for WordPress, Shopify, Magento, React, Next.js — by senior engineers.
01 / A better starting point
Is Your Speed Optimisation Costing You Customers Every Day?
Most businesses lose customers every day to underperforming speed optimisation. If any of these sound familiar, you are losing revenue right now:
02 / Built around your ambition
Our website speed optimisation services — 8 Lightning Solutions
- 01
Core Web Vitals audit (LCP, CLS, INP)
Lab and field data analysis of LCP, CLS and INP across key templates, identifying the specific assets, scripts and server issues causing each failure.
- 02
Image optimisation and modern formats (WebP, AVIF)
Images compressed, resized for each breakpoint and converted to WebP or AVIF, with lazy loading below the fold and explicit dimensions to prevent layout shift.
- 03
JavaScript and CSS optimisation
Removing unused code, splitting bundles, deferring non-critical scripts and minifying CSS so the browser downloads and processes less before the page becomes usable.
- 04
Server-side caching and CDN setup
Page, object and edge caching configured on your hosting, plus CDN setup so static assets load from locations near your visitors.
- 05
Database and query performance tuning
Slow queries, bloated tables, autoloaded options and missing indexes identified and fixed, reducing server response time on dynamic pages such as search, carts and accounts.
- 06
Critical CSS and resource hints
Above-the-fold CSS inlined and preload, preconnect and fetch priority hints added, so the most important content renders first instead of waiting for full stylesheets.
- 07
Third-party script audit and reduction
Every third-party tag reviewed for value and cost, with unnecessary scripts removed and the rest delayed, self-hosted or loaded only on the pages that need them.
- 08
Real User Monitoring (RUM) setup
Real User Monitoring set up to track Core Web Vitals from actual visitors, with alerts when a release or new plugin pushes performance back over thresholds.
The Payoff
What Website Speed Optimisation Changes for You
Passing Core Web Vitals
We work on LCP, INP and CLS until your key templates meet Google's recommended thresholds for real users.
Pages that respond when tapped
Reducing long JavaScript tasks improves INP, so buttons, menus and forms react without a frustrating delay.
Layouts that stay put
Reserved space for images, ads and embeds stops content jumping around while the page loads.
Visibility into real-user speed
Real User Monitoring shows how your site performs for actual visitors, not just in a lab test.
How we work / From idea to impact
Our Website Speed Optimisation Process
- 01
Field and lab measurement
We combine CrUX field data with lab tests to see which templates fail LCP, INP or CLS and why.
- 02
Bottleneck diagnosis
We trace each slow metric to its cause, whether that is an oversized hero image, render-blocking CSS, a heavy plugin or a slow server response.
- 03
Front-end fixes
Images move to WebP or AVIF, critical CSS is inlined, JavaScript is split and deferred, and resource hints are added.
- 04
Server and caching work
We tune caching, CDN configuration and database queries to cut server response time.
- 05
Third-party script review
Every external script is assessed for value and loaded later, more efficiently, or not at all.
- 06
Verification and monitoring
We confirm improvements in field data over the following weeks and set up monitoring so regressions are caught early.
Why Devintek
Why Choose Devintek for Website Speed Optimisation
Developers do the work, so fixes go into your code, not a to-do list
Measured against real-user data, not just a Lighthouse score
Up to date with INP as the responsiveness metric
Experience with WordPress, Shopify, Next.js and custom builds
Improvements made without stripping out features your team relies on
Monitoring left in place so speed does not slip after handover
Your vision. Our craft.
Strategy, design and development working as one connected team.
Industries
Industries Benefiting from Our Website Speed Optimisation
- Ecommerce
- News and Publishing
- SaaS
- Travel and Booking
- Media and Entertainment
- Financial Services
- Marketplaces
Investment
Speed Optimisation Packages for Core Web Vitals
Speed Audit
From USD 1.5K
- LCP, CLS and INP diagnosis
- Template-level issue list
- Third-party script review
- Prioritised fix plan
Full Optimisation Programme
From USD 6K
- Image, JS and CSS optimisation
- Caching and CDN configuration
- Database query tuning
- Before and after benchmarks
Performance Retainer
From USD 1K/month
- Real User Monitoring and alerts
- Release performance checks
- Monthly Core Web Vitals report
- Ongoing plugin and script reviews
FAQ
Frequently Asked Questions
Still have questions?
Our team replies within one business day with a straight answer, not a sales pitch.
Contact usWebsite Speed Optimisation Services for Growing Businesses
Website speed optimisation services have become essential as Core Web Vitals consolidate their role in Google's ranking algorithm. Sites failing LCP, CLS or INP thresholds see compounding ranking pressure, while sites that pass with margin pick up tie-breaker advantages in competitive SERPs. Beyond rankings, slow sites cost conversion rate — Amazon's classic data showed every 100ms of latency cost 1% in sales, and the impact only intensifies for mobile users on slower connections. Devintek runs website speed optimisation engagements for WordPress, WooCommerce, Shopify, Shopify Plus, Magento, Webflow, Wix Studio, React, Next.js and custom-built sites. Every engagement starts with a Core Web Vitals audit covering Largest Contentful Paint (LCP), Cumulative Layout Shift (CLS), and Interaction to Next Paint (INP), plus broader Lighthouse performance, accessibility, best practices and SEO scores. We use real-user monitoring data from Chrome User Experience Report (CrUX) where available, supplemented with synthetic testing across mobile and desktop. The audit identifies the specific bottlenecks: render-blocking resources, large unoptimised images, heavy JavaScript bundles, slow server response times, layout shifts from unset image dimensions, slow third-party scripts (chat widgets, analytics, ad tags), inefficient database queries, missing browser caching, missing CDN distribution. Remediation includes image optimisation (WebP/AVIF conversion, responsive serving, lazy loading), JavaScript optimisation (code splitting, deferring, removing unused code), CSS optimisation (critical CSS extraction, removing unused styles), server-side caching, CDN deployment (Cloudflare, BunnyCDN, AWS CloudFront), third-party script audit and reduction, font optimisation (preloading, subsetting), and platform-specific tuning (WordPress object caching, Shopify Liquid optimisation, Magento Varnish caching). Every optimisation engagement ends with verifiable performance metrics — before-and-after Lighthouse reports, Search Console Core Web Vitals confirmation after the 28-day field-data refresh window, and ongoing Real User Monitoring setup so performance is tracked permanently.
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