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.
BigCommerce Audit
Analyzed platform-specific performance constraints and opportunities.
Theme Optimization
Optimized Stencil theme templates for faster rendering.
Product Image Optimization
Optimized product images across the entire catalog.
Script Management
Deferred and minimized third-party scripts.
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.
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