--- title: "Liz Mathe: Mobile LCP 15.6s to 4.4s | Case Study" description: "Liz Mathe runs a BigCommerce store with a large product catalog. They needed speed optimization to improve the shopping experience and handle their extensi" lang: en json-ld: | [ { "@context": "https://schema.org", "@type": "Article", "headline": "Stencil Theme & Product Catalog Optimization for BigCommerce Store", "description": "Liz Mathe runs a BigCommerce store with a large product catalog. They needed speed optimization to improve the shopping experience and handle their extensive product pages efficiently.", "publisher": { "@type": "Organization", "name": "PageSpeed Matters" } }, { "@context": "https://schema.org", "@type": "BreadcrumbList", "itemListElement": [ { "@type": "ListItem", "position": 1, "name": "Home", "item": "https://www.pagespeedmatters.com/" }, { "@type": "ListItem", "position": 2, "name": "Proof", "item": "https://www.pagespeedmatters.com/proof" }, { "@type": "ListItem", "position": 3, "name": "Case Studies", "item": "https://www.pagespeedmatters.com/proof/case-studies" }, { "@type": "ListItem", "position": 4, "name": "Liz Mathe" } ] } ] --- [![PageSpeed Matters](/assets/logo-DtyG_mQE.png)](/) - [Benefits](/why-speed-matters) - [Services](/services) - [ROI Calculator](/roi) - [Pricing](/pricing) - [Proof](/proof) - [Resources](/resources) - [About](/about) [Speed Audit](/contact) [Let's Talk](/contact) [![PageSpeed Matters](/assets/logo-DtyG_mQE.png)](/) [Benefits](/why-speed-matters)[Services](/services)[ROI Calculator](/roi)[Pricing](/pricing)[Proof](/proof)[Resources](/resources)[About](/about) Popular Services [ Core Web Vitals Optimization ](/services/core-web-vitals-optimization)[ ![WordPress Speed Optimization](data:image/svg+xml,%3csvg%20role='img'%20viewBox='0%200%2024%2024'%20xmlns='http://www.w3.org/2000/svg'%3e%3ctitle%3eWordPress%3c/title%3e%3cpath%20d='M21.469%206.825c.84%201.537%201.318%203.3%201.318%205.175%200%203.979-2.156%207.456-5.363%209.325l3.295-9.527c.615-1.54.82-2.771.82-3.864%200-.405-.026-.78-.07-1.11m-7.981.105c.647-.03%201.232-.105%201.232-.105.582-.075.514-.93-.067-.899%200%200-1.755.135-2.88.135-1.064%200-2.85-.15-2.85-.15-.585-.03-.661.855-.075.885%200%200%20.54.061%201.125.09l1.68%204.605-2.37%207.08L5.354%206.9c.649-.03%201.234-.1%201.234-.1.585-.075.516-.93-.065-.896%200%200-1.746.138-2.874.138-.2%200-.438-.008-.69-.015C4.911%203.15%208.235%201.215%2012%201.215c2.809%200%205.365%201.072%207.286%202.833-.046-.003-.091-.009-.141-.009-1.06%200-1.812.923-1.812%201.914%200%20.89.513%201.643%201.06%202.531.411.72.89%201.643.89%202.977%200%20.915-.354%201.994-.821%203.479l-1.075%203.585-3.9-11.61.001.014zM12%2022.784c-1.059%200-2.081-.153-3.048-.437l3.237-9.406%203.315%209.087c.024.053.05.101.078.149-1.12.393-2.325.609-3.582.609M1.211%2012c0-1.564.336-3.05.935-4.39L7.29%2021.709C3.694%2019.96%201.212%2016.271%201.211%2012M12%200C5.385%200%200%205.385%200%2012s5.385%2012%2012%2012%2012-5.385%2012-12S18.615%200%2012%200'/%3e%3c/svg%3e) WordPress Speed Optimization ](/services/wordpress-speed-optimization)[ ![WooCommerce Speed Optimization](data:image/svg+xml,%3csvg%20role='img'%20viewBox='0%200%2024%2024'%20xmlns='http://www.w3.org/2000/svg'%3e%3ctitle%3eWoo%3c/title%3e%3cpath%20d='M2.227%204.857A2.228%202.228%200%20000%207.094v7.457c0%201.236%201.001%202.237%202.237%202.237h5.36l2.39%202.076-.462-2.076h4.238a2.228%202.228%200%20002.237-2.237V7.094a2.228%202.228%200%2000-2.237-2.237H2.227zm4.636%201.885h.053c.115.002.22.04.316.117a.46.46%200%2001.183.336c.014.098-.003.177-.058.283-.23.422-.418%201.131-.57%202.12-.147.957-.202%201.706-.166%202.24a.694.694%200%2001-.07.387.377.377%200%2001-.31.213c-.153.01-.314-.06-.466-.22-.548-.558-.982-1.393-1.3-2.504-.382.752-.664%201.316-.846%201.692-.347.665-.643%201.005-.888%201.022-.16.012-.295-.122-.412-.403-.302-.771-.624-2.258-.97-4.464a.526.526%200%2001.096-.393c.083-.113.205-.168.37-.18.3-.024.47.114.511.42.183%201.23.384%202.272.596%203.124l1.286-2.453c.117-.224.265-.34.443-.352.258-.018.42.147.483.495.147.78.333%201.445.558%202.01.152-1.493.412-2.57.779-3.234a.452.452%200%2001.386-.26zm2.288.637c.099%200%20.205.01.318.035.411.088.728.313.938.683.19.318.286.699.286%201.156%200%20.607-.154%201.157-.46%201.663-.355.587-.813.884-1.383.884a1.557%201.557%200%2001-.318-.039.763.763%200%2001-.141-.05%201.351%201.351%200%2001-.799-.63%202.277%202.277%200%2001-.28-1.166c0-.605.151-1.158.457-1.658.358-.59.818-.88%201.382-.878zm3.687%200c.099%200%20.205.01.318.035.418.088.728.313.938.683.19.318.283.699.283%201.156%200%20.607-.153%201.157-.459%201.663-.354.587-.812.884-1.382.884a1.557%201.557%200%2001-.318-.039%201.352%201.352%200%2001-.94-.68%202.277%202.277%200%2001-.283-1.166c0-.605.154-1.158.46-1.658.358-.59.818-.88%201.383-.878zm-3.504.636a.636.636%200%2000-.534.373%201.908%201.908%200%2000-.354%201.13c0%20.17.035.354.106.536.087.23.207.35.347.38.147.029.306-.034.478-.187.218-.195.363-.483.446-.87.028-.137.041-.283.041-.436%200-.171-.035-.354-.106-.535-.088-.23-.206-.35-.347-.38a.436.436%200%2000-.077-.011zm3.688%200a.636.636%200%2000-.535.373%201.908%201.908%200%2000-.354%201.13c0%20.17.036.354.107.536.086.23.206.35.347.38.147.029.306-.034.478-.187.217-.195.362-.483.445-.87.024-.137.041-.283.041-.436%200-.171-.035-.354-.106-.535-.088-.23-.206-.35-.347-.38a.436.436%200%2000-.076-.011z'/%3e%3c/svg%3e) WooCommerce Speed Optimization ](/services/woocommerce-speed-optimization)[ ![Shopify Speed Optimization](data:image/svg+xml,%3csvg%20role='img'%20viewBox='0%200%2024%2024'%20xmlns='http://www.w3.org/2000/svg'%3e%3ctitle%3eShopify%3c/title%3e%3cpath%20d='M15.337%2023.979l7.216-1.561s-2.604-17.613-2.625-17.73c-.018-.116-.114-.192-.211-.192s-1.929-.136-1.929-.136-1.275-1.274-1.439-1.411c-.045-.037-.075-.057-.121-.074l-.914%2021.104h.023zM11.71%2011.305s-.81-.424-1.774-.424c-1.447%200-1.504.906-1.504%201.141%200%201.232%203.24%201.715%203.24%204.629%200%202.295-1.44%203.76-3.406%203.76-2.354%200-3.54-1.465-3.54-1.465l.646-2.086s1.245%201.066%202.28%201.066c.675%200%20.975-.545.975-.932%200-1.619-2.654-1.694-2.654-4.359-.034-2.237%201.571-4.416%204.827-4.416%201.257%200%201.875.361%201.875.361l-.945%202.715-.02.01zM11.17.83c.136%200%20.271.038.405.135-.984.465-2.064%201.639-2.508%203.992-.656.213-1.293.405-1.889.578C7.697%203.75%208.951.84%2011.17.84V.83zm1.235%202.949v.135c-.754.232-1.583.484-2.394.736.466-1.777%201.333-2.645%202.085-2.971.193.501.309%201.176.309%202.1zm.539-2.234c.694.074%201.141.867%201.429%201.755-.349.114-.735.231-1.158.366v-.252c0-.752-.096-1.371-.271-1.871v.002zm2.992%201.289c-.02%200-.06.021-.078.021s-.289.075-.714.21c-.423-1.233-1.176-2.37-2.508-2.37h-.115C12.135.209%2011.669%200%2011.265%200%208.159%200%206.675%203.877%206.21%205.846c-1.194.365-2.063.636-2.16.674-.675.213-.694.232-.772.87-.075.462-1.83%2014.063-1.83%2014.063L15.009%2024l.927-21.166z'/%3e%3c/svg%3e) Shopify Speed Optimization ](/services/shopify-speed-optimization)[ ![Wix Speed Optimization](data:image/svg+xml,%3csvg%20role='img'%20viewBox='0%200%2024%2024'%20xmlns='http://www.w3.org/2000/svg'%3e%3ctitle%3eWix%3c/title%3e%3cpath%20d='m0%207.354%202.113%209.292h.801a1.54%201.54%200%200%200%201.506-1.218l1.351-6.34a.171.171%200%200%201%20.167-.137c.08%200%20.15.058.167.137l1.352%206.34a1.54%201.54%200%200%200%201.506%201.218h.805l2.113-9.292h-.565c-.62%200-1.159.43-1.296%201.035l-1.26%205.545-1.106-5.176a1.76%201.76%200%200%200-2.19-1.324c-.639.176-1.113.716-1.251%201.365l-1.094%205.127-1.26-5.537A1.33%201.33%200%200%200%20.563%207.354H0zm13.992%200a.951.951%200%200%200-.951.95v8.342h.635a.952.952%200%200%200%20.951-.95V7.353h-.635zm1.778%200%203.158%204.66-3.14%204.632h1.325c.368%200%20.712-.181.918-.486l1.756-2.59a.12.12%200%200%201%20.197%200l1.754%202.59c.206.305.55.486.918.486h1.326l-3.14-4.632L24%207.354h-1.326c-.368%200-.712.181-.918.486l-1.772%202.617a.12.12%200%200%201-.197%200L18.014%207.84a1.108%201.108%200%200%200-.918-.486H15.77z'/%3e%3c/svg%3e) Wix Speed Optimization ](/services/wix-speed-optimization)[ ![BigCommerce Speed Optimization](data:image/svg+xml,%3csvg%20role='img'%20viewBox='0%200%2024%2024'%20xmlns='http://www.w3.org/2000/svg'%3e%3ctitle%3eBigCommerce%3c/title%3e%3cpath%20d='M12.645%2013.663h3.027c.861%200%201.406-.474%201.406-1.235%200-.717-.545-1.234-1.406-1.234h-3.027c-.1%200-.187.086-.187.172v2.125c.015.1.086.172.187.172zm0%204.896h3.128c.961%200%201.535-.488%201.535-1.35%200-.746-.545-1.35-1.535-1.35h-3.128c-.1%200-.187.087-.187.173v2.34c.015.115.086.187.187.187zM23.72.053l-8.953%208.93h1.464c2.281%200%203.63%201.435%203.63%203%200%201.235-.832%202.14-1.722%202.541-.143.058-.143.259.014.316%201.033.402%201.765%201.48%201.765%202.742%200%201.78-1.19%203.202-3.5%203.202h-6.342c-.1%200-.187-.086-.187-.172V13.85L.062%2023.64c-.13.13-.043.359.143.359h23.631a.16.16%200%200%200%20.158-.158V.182c.043-.158-.158-.244-.273-.13z'/%3e%3c/svg%3e) BigCommerce Speed Optimization ](/services/bigcommerce-speed-optimization)[ ![Webflow Speed Optimization](data:image/svg+xml,%3csvg%20role='img'%20viewBox='0%200%2024%2024'%20xmlns='http://www.w3.org/2000/svg'%3e%3ctitle%3eWebflow%3c/title%3e%3cpath%20d='m24%204.515-7.658%2014.97H9.149l3.205-6.204h-.144C9.566%2016.713%205.621%2018.973%200%2019.485v-6.118s3.596-.213%205.71-2.435H0V4.515h6.417v5.278l.144-.001%202.622-5.277h4.854v5.244h.144l2.72-5.244H24Z'/%3e%3c/svg%3e) Webflow Speed Optimization ](/services/webflow-speed-optimization)[ ![Squarespace Speed Optimization](data:image/svg+xml,%3csvg%20role='img'%20viewBox='0%200%2024%2024'%20xmlns='http://www.w3.org/2000/svg'%3e%3ctitle%3eSquarespace%3c/title%3e%3cpath%20d='M22.655%208.719c-1.802-1.801-4.726-1.801-6.564%200l-7.351%207.35c-.45.45-.45%201.2%200%201.65.45.449%201.2.449%201.65%200l7.351-7.351c.899-.899%202.362-.899%203.264%200%20.9.9.9%202.364%200%203.264l-7.239%207.239c.9.899%202.362.899%203.263%200l5.589-5.589c1.836-1.838%201.836-4.763.037-6.563zm-2.475%202.437c-.451-.45-1.201-.45-1.65%200l-7.354%207.389c-.9.899-2.361.899-3.262%200-.45-.45-1.2-.45-1.65%200s-.45%201.2%200%201.649c1.801%201.801%204.726%201.801%206.564%200l7.351-7.35c.449-.487.449-1.239.001-1.688zm-2.439-7.35c-1.801-1.801-4.726-1.801-6.564%200l-7.351%207.351c-.45.449-.45%201.199%200%201.649s1.2.45%201.65%200l7.395-7.351c.9-.899%202.371-.899%203.27%200%20.451.45%201.201.45%201.65%200%20.421-.487.421-1.199-.029-1.649h-.021zm-2.475%202.437c-.45-.45-1.2-.45-1.65%200l-7.351%207.389c-.899.9-2.363.9-3.265%200-.9-.899-.9-2.363%200-3.264l7.239-7.239c-.9-.9-2.362-.9-3.263%200L1.35%208.719c-1.8%201.8-1.8%204.725%200%206.563%201.801%201.801%204.725%201.801%206.564%200l7.35-7.351c.451-.488.451-1.238%200-1.688h.002z'/%3e%3c/svg%3e) Squarespace Speed Optimization ](/services/squarespace-speed-optimization) [Book a Call](/contact) ![](/assets/liz-mathe-BS3yUOes.png) [Back to Case Studies](/proof/case-studies) Speed Optimization # Stencil Theme & Product Catalog Optimization for BigCommerce Store E-Commerce · < 10 Employees · BigCommerce 72% Mobile LCP Reduction 88% Mobile TBT Reduction 57% Mobile SI Reduction ## Project Overview Liz Mathe runs a BigCommerce store with a large product catalog. They needed speed optimization to improve the shopping experience and handle their extensive product pages efficiently. With a large amount of products, the store's category and product pages were loading slowly. BigCommerce's platform constraints required creative approaches to optimization. ## Goals & Objectives The primary goal of this project was to improve Google's Core Web Vitals, site speed, and overall user experience and usability. Our primary goals were to: - Reduce mobile LCP significantly - Eliminate layout shift across devices - Improve mobile performance score above 80 Company Name Liz Mathe Company Size < 10 Employees Industry E-Commerce Platform BigCommerce ## Outcomes: Core metrics that improved over the duration of the project. 72% Mobile LCP Reduction Mobile LCP dropped from 15.6s to 4.4s, a 72% improvement. 88% Mobile TBT Reduction Mobile TBT reduced from 170ms to just 20ms. 57% Mobile SI Reduction Mobile Speed Index improved from 6.8s to 2.9s, a 57% improvement. ## Before vs After Before Metric Score Mobile Perf Score 56 Desktop Perf Score 85 Mobile FCP 6.1s Desktop FCP 1.0s Mobile LCP 15.6s Desktop LCP 1.1s Mobile TBT 170ms Desktop TBT 20ms Mobile CLS 0.058 Desktop CLS 0.002 Mobile SI 6.8s Desktop SI 1.2s After Metric Score Mobile Perf Score 85 Desktop Perf Score 85 Mobile FCP 2.1s Desktop FCP 0.6s Mobile LCP 4.4s Desktop LCP 0.8s Mobile TBT 20ms Desktop TBT 0ms Mobile CLS 0 Desktop CLS 0 Mobile SI 2.9s Desktop SI 1.2s ## Our Approach A systematic, step-by-step process tailored to Liz Mathe's needs. 1 ### BigCommerce Audit Analyzed platform-specific performance constraints and opportunities. 2 ### Theme Optimization Optimized Stencil theme templates for faster rendering. 3 ### Product Image Optimization Optimized product images across the entire catalog. 4 ### Script Management Deferred and minimized third-party scripts. 5 ### Category Page Optimization Improved load times for product listing pages. ## Key Takeaways BigCommerce requires platform-specific optimization strategies. Large product catalogs need image optimization at scale. Category page performance directly impacts product discovery and sales. ## Latest Case Studies [![NSAR](/assets/nsar-CA3Du5tg.jpg) Core Web Vitals WooCommerce NSAR E-Commerce WooCommerce Service Animal Support | < 10 Employees ### How We Helped National Service Animal Registry Improve Site Speed and Pass Core Web Vitals Read Case Study](/proof/case-studies/nsarco) [![Try Something More](/assets/try-something-more-D54ZNz-1.png) Core Web Vitals WordPress Try Something More Content WordPress Lifestyle & Content | < 10 Employees ### Plugin Reduction & Template-Level CWV Optimization for Content-Heavy WordPress Site Read Case Study](/proof/case-studies/try-something-more) [![Her Fantasy Box](/assets/her-fantasy-box-CNC8Ngq7.webp) Core Web Vitals Shopify Plus Her Fantasy Box E-Commerce Shopify Plus Health & Wellness | < 50 Employees ### How We Helped Her Fantasy Box Improve Site Speed by 300% and Pass Core Web Vitals Read Case Study](/proof/case-studies/her-fantasy-box) [![Sana Benefits](/assets/sana-benefits-BJOIqgen.png) Core Web Vitals WordPress Sana Benefits B2B WordPress Insurance | 200-500 Employees ### How We Helped Sana Benefits Improve Site Speed by 250% and Pass Core Web Vitals Read Case Study](/proof/case-studies/sana-benefits) [![Whistleblower Partners](/assets/whistleblower-partners-7MU0S4cS.webp) Core Web Vitals Migrated from Squarespace to WordPress Whistleblower Partners Legal Migration Legal Services | 11 to 50 Employees ### How We Helped Whistleblower Partners Improve Site Speed and Migrate 200+ Pages to WordPress Read Case Study](/proof/case-studies/whistleblower-partners) [![Vibeszn](/assets/vibeszn-CgzK4Wvb.png) Core Web Vitals Shopify Vibeszn E-Commerce Shopify Lifestyle & Apparel | < 10 Employees ### Theme & App Script Optimization for Shopify Core Web Vitals Read Case Study](/proof/case-studies/vibeszn) [![Pure Parima](/assets/pure-parima-DnL2KsUd.webp) Core Web Vitals Shopify Pure Parima E-Commerce Shopify Home Furnishings | < 10 Employees ### How We Helped Pure Parima Improve Site Speed and Pass Core Web Vitals Read Case Study](/proof/case-studies/pure-parima) [![Therapevo](/assets/therapevo-BaKBbgzb.webp) Core Web Vitals WordPress Therapevo Healthcare WordPress Therapy and Counseling | < 10 Employees ### How We Helped Therapevo Improve Site Speed and Pass Core Web Vitals Read Case Study](/proof/case-studies/therapevo) ## Want Results Like These? 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