BigCommerce Speed Optimization Agency for Growing Stores
Expert BigCommerce Speed Optimization Services
Stencil theme, app, and image delivery optimization, engineered to speed up your BigCommerce store and lift conversions.
BigCommerce hosts your store, so the server is out of your hands, but most of the speed is still on the table. App scripts stacking up, render-blocking Stencil theme code, oversized images, and third-party pixels all drag down your store. Our BigCommerce speed optimization service audits every app and theme asset, removes the dead weight, and tunes image and script delivery so your store loads fast and converts more visitors.
BigCommerce speed optimization is the process of reducing a BigCommerce store's load time by auditing app scripts, trimming render-blocking Stencil theme code, compressing and resizing images, and deferring third-party tags. Done well, it lifts Core Web Vitals, search rankings, and conversion rate without changing how the store looks.
Trusted by leading brands
Our Expertise
Work With a BigCommerce Speed Optimization Expert
Most speed apps promise a one-click fix and add another script to your store. We don't. Every engagement is run by a BigCommerce speed optimization expert who profiles your store at the code level: every installed app and its scripts, Stencil theme render cost, and image and pixel weight. Then we cut what is not earning its place and tune the rest.
Growing stores come to us as their BigCommerce speed optimization agency because we show our work. You get a ranked app-impact report, before and after Core Web Vitals data, and documentation of every change, not a black box.
1,500+
Optimization projects
100%
Core Web Vitals pass rate
90+
PageSpeed scores
Matt Suffoletto
Founder & CEO
BigCommerce Speed Optimization Expert
Who This Is For
Is This Right for You?
Product Stores
Product-based stores need fast collection pages, image-heavy product pages, and instant filtering.
B2B & Wholesale
B2B stores with customer-specific pricing and complex catalogs need fast search and account pages.
Multi-Storefront
Multi-storefront setups need each storefront independently optimized for its target audience.
Headless Commerce
Headless BigCommerce builds need optimized API calls, efficient data fetching, and fast client-side rendering.
Common Problems
What's Slowing You Down?
Stencil Theme Bloat
BigCommerce's Stencil themes accumulate customizations over time. Unused Handlebars partials, excessive front-matter data fetching, and render-blocking CSS/JS compound into slow page loads.
Guide: BigCommerce Stencil OptimizationApp Script Overload
Every installed BigCommerce app adds JavaScript, CSS, and API calls to your store. Reviews, upsells, chat widgets, and analytics tools compound into 2–4 seconds of extra load time.
Guide: BigCommerce App Impact RankingSlow Product & Category Pages
Large product catalogs with high-res images, variant selectors, and faceted search create heavy pages. Unoptimized product images alone can account for 60%+ of page weight.
Guide: BigCommerce Product Page SpeedCheckout & Cart Abandonment
Payment gateway scripts, shipping calculators, and third-party checkout integrations make the most revenue-critical pages the slowest, driving up cart abandonment rates.
Guide: BigCommerce Checkout SpeedOur Solutions
How We Speed Up Your BigCommerce Store
We work on a copy of your theme, so your live store is never at risk. We audit and trim apps, refactor Stencil templates, optimize image and script delivery, and fix Core Web Vitals on your product and category pages. Here is what that covers:
Stencil Theme Profiling
We audit every Handlebars template for rendering efficiency, front-matter data over-fetching, unused partials, and CSS/JS bloat. You receive a ranked impact report with specific optimization recommendations and before/after render times.
App Impact Analysis & Cleanup
We profile every installed app individually for JavaScript weight, API call overhead, and render-blocking behavior. You get a ranked report showing exactly which apps cost the most speed, with vetted faster alternatives and migration steps.
Image & Asset Optimization
We implement responsive srcsets, modern formats (WebP/AVIF), proper lazy loading, and Akamai CDN optimization for all product images, hero banners, and category thumbnails, without sacrificing visual quality.
Checkout Performance Engineering
We defer non-critical payment gateway scripts, optimize shipping rate calculations, reduce DOM complexity on checkout, and ensure the most revenue-critical pages load in under 2 seconds.
Core Web Vitals Engineering
We target LCP, INP, and CLS individually, fixing layout shifts from product galleries, optimizing interaction handlers on collection pages, and monitoring real-user CrUX data until all metrics pass Google's 28-day rolling window.
Performance Safeguarding
After deployment, we provide 30 days of monitoring to catch regressions from app updates, theme changes, or BigCommerce platform updates. You receive a Speed Budget Document with max JS size, image targets, and app limits.
The Data
What Happens When You Improve BigCommerce Site Speed
On an ecommerce store, speed is conversion rate. When you improve BigCommerce site speed, faster product and category pages keep shoppers moving toward checkout, lift organic traffic from passing Core Web Vitals, and lower your cost per click through a better Quality Score.
Proof
Our Results
Real stores, real speed improvements, real revenue impact.
Liz Mathe
Stencil theme optimization with improved PageSpeed and Core Web Vitals across all product pages.
View Case Study
Platterful
80% speed improvement, 20% conversion lift. Mobile score from 50s to 90+.
View Case Study
Pure Parima
38% LCP improvement, 100% CLS fix. Passed all Core Web Vitals.
View Case StudyROI Calculator
How Much Revenue Is Your Slow Site Costing You?
Enter your URL — in 30 seconds, you'll see exactly how much revenue slow speed is costing you.
Enter your website URL
10,000+ sites analyzed · No login required · See your losses in 30 seconds
Our Process
How It Works
Staging & Full Audit
We run a comprehensive performance audit, PageSpeed, Core Web Vitals, Stencil template profiling, app script analysis, and real-device testing. Your live store is never touched during this phase.
App & Template Impact Ranking
Every installed app and Stencil template is profiled individually for rendering time, JavaScript footprint, and API overhead. You receive a ranked report showing exactly which components cost the most speed.
Optimization Sprint
1 to 2 WeeksOver 1–2 weeks, we implement all fixes: Stencil template optimization, app script deferral, Critical CSS generation, image optimization, and checkout tuning. Zero downtime to your live store.
Core Web Vitals Fine-Tuning
2 to 4 WeeksWe monitor real-user field data (CrUX) over 2–4 weeks, making iterative adjustments until LCP, INP, and CLS consistently pass in Google's 28-day rolling window, not just lab scores.
Deployment & Documentation
Once validated, all changes go live. You receive complete documentation of every change made, a speed budget for future development, and a before/after performance report.
Deliverables
What You'll Receive
Every engagement includes comprehensive documentation and reporting.
Before/After Speed Report
PageSpeed and Core Web Vitals scores before and after optimization, with waterfall comparisons.
App Impact Report
Every installed app ranked by JavaScript weight, API calls, and render-blocking behavior with specific load-time cost.
App Replacement Playbook
For every slow app identified, a vetted faster alternative with step-by-step migration instructions.
Stencil Theme Audit
Detailed analysis of Handlebars templates, front-matter configuration, and CSS/JS delivery with optimization results.
Competitor Speed Benchmark
How your store stacks up against 3–5 direct competitors on LCP, TTFB, and Speed Index.
Core Web Vitals Forecast
Projecting exactly which metrics (LCP, CLS, INP) will move into the 'Green' zone, with expected timelines.
Image Optimization Report
Analysis of product image delivery, format optimization, and CDN configuration with before/after file sizes.
Revenue Impact Projection
Custom report mapping your speed improvements to projected revenue gains using your actual traffic and conversion data.
Google Ads / CPC Savings Report
Analysis of how improved page speed lowers your Quality Score penalty and reduces cost-per-click for paid campaigns.
30-Day Post-Launch Monitoring
30 days of monitoring after deployment to ensure gains hold after app updates, theme changes, or platform updates.
SEO Impact Forecast
Projected ranking improvements based on Core Web Vitals fixes, with estimated organic traffic gains from your Search Console data.
Speed Budget Document
A living document setting performance budgets for future development, max JS size, image targets, app limits.
Executive Summary (1-Pager)
A non-technical summary for stakeholders showing what was done, what improved, and what it means in dollars.
Checkout Performance Audit
Page-by-page analysis of cart, checkout, and account pages with specific optimization recommendations.
Third-Party Script Analysis
Every external script identified and categorized with defer, async, or remove recommendations.
Pricing
Transparent Speed Optimization Pricing
Get an instant estimate based on your site profile. No hidden fees, no lock-in contracts — just measurable speed improvements and revenue gains.
Step 1 of 8
Takes ~2 minutesWhat's your main goal?
Pick the outcome that matters most to you.
What We Optimize
Optimize BigCommerce Site Speed at Every Layer
On BigCommerce the server is managed, so the biggest wins come from the theme, the apps, and how assets are delivered. We optimize BigCommerce site speed across all three.
Stencil Theme Optimization
Refactor Stencil templates, Handlebars partials, and front-matter to cut render time and reduce TTFB on product and category pages.
Script & Asset Delivery
Audit every third-party script and pixel, defer non-critical JavaScript, inline critical CSS, and remove render-blocking assets so the page paints sooner.
App Impact Profiling
Profile each installed BigCommerce app for JavaScript weight, API overhead, and main-thread cost. Replace or remove the heaviest offenders without losing functionality.
Akamai CDN & Caching
Tune BigCommerce's built-in Akamai CDN and cache headers so static assets and pages are delivered from the edge with the right TTLs.
Headless & GraphQL Performance
Optimize GraphQL and REST calls for headless BigCommerce builds on Catalyst, Next.js, or custom React, with efficient data fetching and edge rendering.
BigCommerce Mobile Speed
Fix BigCommerce mobile speed at the page level: responsive image delivery, lighter mobile bundles, and BigCommerce LCP improvements on product templates.
Deep Dives
BigCommerce Speed Guides
Want to do it yourself? Read our guide on how to speed up your BigCommerce store, or dig into the wider library below.
FAQ
Frequently Asked Questions
Testimonials
What BigCommerce Clients Say
"Platterful saw major improvements in site speed after working with Matt and the PageSpeed Matters team. They took our mobile score from the 50s to over 90 while keeping SEO intact. They were responsive, helpful, and continued to support us even after the project ended. Highly recommend."
Mobile score: 50s → 90+ • Conversions: +20%
Lowell
Co-Founder, Platterful
"Outstanding results! Matt and his team delivered measurable outcomes for our company, something larger firms promised but never followed through on. Truly impressive work!"
Passed Core Web Vitals on key pages
Cody Stehlik
NSAR (WooCommerce store)
"Matt was thoughtful, professional and competent. His communication skills are excellent and he is a pleasure to work with. The project was a success and we highly recommend Matt and the PageSpeed Matters team."
Mobile LCP 8.0s → 3.0s • Mobile Score 59 → 94
Monthly Moxie
Subscription Box Store (WooCommerce)
Ready to Get Started?
Request an audit and see exactly how we can improve your BigCommerce store's performance.
Request An Audit