Magento Performance Optimisation

A slow Magento store costs you customers, conversions, and search rankings. We specialise in making Magento stores significantly faster, delivering measurable improvements that directly impact your bottom line.

Get Your Free Performance Audit
  • 65% Faster - Joanie Clothing results
  • 45% More Conversions - Tieroom results
  • 24/7 Monitoring
  • 99.9% Uptime
  • £100/hr Billed to the minute

Why Performance Matters

  • Conversion Rate

    Every 100ms of delay costs you conversions. Amazon found that just 100ms of additional load time resulted in a 1% drop in revenue. For Magento stores processing thousands of transactions, even small speed improvements translate into significant revenue gains.

  • SEO Rankings

    Google uses Core Web Vitals as ranking signals in its search algorithm. Faster sites rank higher in search results, driving more organic traffic to your store. Poor performance means your competitors are outranking you.

  • Bounce Rate

    53% of mobile users abandon sites that take longer than 3 seconds to load. Every second of delay increases bounce rates and reduces the number of customers who make it through your checkout process.

  • Customer Trust

    Fast, reliable stores build confidence and encourage repeat purchases. Customers associate site speed with professionalism and trustworthiness, making performance a critical factor in long-term customer retention.

What We Optimise

  • Core Web Vitals

    LCP, FID/INP, and CLS optimisation to meet Google's performance thresholds and improve your search rankings. We target the specific metrics that affect your visibility.

  • Database Performance

    Query optimisation, indexing strategy, and table maintenance to eliminate slow database operations that bottleneck your store's response times.

  • Full Page Cache

    Varnish configuration, cache warming, and hole-punching to ensure your pages are served instantly from cache rather than regenerated on every request.

  • Frontend Performance

    JavaScript and CSS optimisation, image compression, lazy loading, and critical rendering path improvements. For stores ready for a bigger leap, a Hyvä theme migration can reduce frontend JavaScript by 90%.

  • Server Tuning

    PHP, MySQL, Redis, and Elasticsearch configuration tuned specifically for your Magento store's traffic patterns and workload.

  • Third-Party Audit

    Identifying slow extensions and external scripts that drag down your store's performance. We pinpoint exactly what's costing you speed and recommend alternatives.

Checkout Speed Optimisation

The checkout is where performance matters most. A slow checkout directly kills conversions, every extra second of loading increases cart abandonment.

  • Payment Gateway Latency

    We profile third-party payment gateway response times and implement asynchronous loading to prevent slow payment providers from blocking the entire checkout page.

  • Shipping Calculation

    Complex shipping rules and real-time carrier lookups can add seconds to checkout. We implement caching strategies and optimise shipping method retrieval to keep the checkout responsive.

  • Checkout JavaScript

    Magento's default checkout loads significant JavaScript. We strip unused components, defer non-critical scripts, and optimise the rendering pipeline to get customers to the payment step faster.

  • Guest vs Registered

    We ensure both guest and registered checkout paths are optimised, with intelligent prefilling, address validation, and minimal form steps to reduce friction and loading.

Proactive Performance Monitoring

New Relic application performance monitoring dashboard showing transaction tracing and throughput metrics

Application Performance Monitoring

New Relic APM provides real-time transaction tracing, database query analysis, and throughput monitoring for your Magento store. We use this data to identify bottlenecks, track performance trends, and ensure your store maintains optimal response times around the clock.

Error Tracking & Alerting

Sentry provides real-time error detection, performance regression alerts, and automated issue routing. When a performance degradation or error occurs, our team is notified instantly, allowing us to resolve issues before they impact your customers. Combined with our security monitoring, this gives you complete visibility into your store's health and protection.

Sentry error tracking dashboard showing real-time error detection and performance regression alerts

Magento Performance Audit

A comprehensive analysis of your Magento store's performance, carried out by certified developers who understand the platform inside and out. We examine every layer of your installation and provide a detailed report with prioritised recommendations.

  • Core Web Vitals analysis
  • Database query profiling
  • Full page cache effectiveness
  • Frontend asset analysis
  • Server configuration review
  • Third-party script impact
  • Extension performance audit
  • Prioritised recommendations report
  • Delivered within 5 working days
  • 30-minute walkthrough call to discuss findings
Request a Performance Audit

Performance Results

Why is my Magento store slow?

The most common causes of a slow Magento store, in order of frequency, are:

  1. Full page cache not working or bypassed by customisations
  2. Varnish or Redis not configured, or misconfigured
  3. Large unoptimised product images served without WebP or AVIF
  4. Database indexes missing or fragmented, especially on catalog_product_entity
  5. Too many third party JavaScript tags loaded synchronously
  6. Inefficient custom modules making blocking API calls during page render
  7. Underpowered hosting that cannot handle the PHP process load during peak traffic

Our performance audit identifies which of these apply to your store and gives you a prioritised list of fixes. If the root cause turns out to be a frontend bottleneck, a move to Hyva is often the fastest route to a 90+ Lighthouse score.

Magento Performance FAQs

  • What is a good Core Web Vitals score for Magento?

    Aim for Largest Contentful Paint under 2.5 seconds, Interaction to Next Paint under 200 milliseconds and Cumulative Layout Shift under 0.1. Most Magento stores we audit fail at least one of these before optimisation.

  • How much Magento performance improvement should I expect?

    Realistic improvements range from 40% to 70% faster page loads depending on the starting state. Our Tieroom case study shows a 65% improvement that drove a 45% conversion rate lift.

What Our Clients Say

  • "We really enjoy working with Interjar; the communication is great and the team are flexible and knowledgeable, using their Magento experience to recommend the best solutions for the site. We know we can always rely on them!"

    Sarah Gallagher
    Head of E-commerce, Joanie Clothing

Find Out What's Slowing Your Store Down

Don't let poor performance cost you customers and revenue. Our Magento performance experts will analyse your store, identify the bottlenecks, and deliver a clear plan to make it faster.

Get Your Free Performance Audit
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Tell us about your project or challenge. We'll review your enquiry and respond within 4 business hours with an initial assessment - no obligation, no hard sell.
  • We respond within 4 business hours
  • No obligation - just a straightforward conversation
  • You'll speak directly with a senior developer
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