Theme & App Script Optimization for Shopify Core Web Vitals
Lifestyle & Apparel · < 10 Employees · Shopify
100%
Mobile TBT Eliminated
53%
Mobile LCP Reduction
100%
Desktop TBT Eliminated
Project Overview
Vibeszn is a Shopify store that needed Core Web Vitals optimization to improve search rankings and deliver a faster shopping experience for their customers.
The store's theme and third-party apps were creating performance bottlenecks, particularly around LCP and INP. These issues were impacting both organic rankings and the shopping experience on mobile devices.
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:
- Eliminate Total Blocking Time on both devices
- Reduce mobile LCP below 2.5s
- Reduce mobile CLS below 0.1
- Company Name
- Vibeszn
- Company Size
- < 10 Employees
- Industry
- Lifestyle & Apparel
- Platform
- Shopify
Outcomes:
Core metrics that improved over the duration of the project.
100%
Mobile TBT Eliminated
Mobile TBT reduced from 890ms to 0ms.
53%
Mobile LCP Reduction
Mobile LCP dropped from 4.3s to 2.0s.
100%
Desktop TBT Eliminated
Desktop TBT reduced from 1,490ms to 0ms.
Before vs After
Before
| Metric | Score |
|---|---|
| Desktop FCP | 0.5s |
| Desktop LCP | 1.0s |
| Desktop TBT | 1,490ms |
| Desktop CLS | 0.011 |
| Desktop SI | 1.8s |
| Mobile FCP | 2.3s |
| Mobile LCP | 4.3s |
| Mobile TBT | 890ms |
| Mobile CLS | 0.123 |
| Mobile SI | 8.7s |
After
| Metric | Score |
|---|---|
| Desktop FCP | 0.3s |
| Desktop LCP | 0.6s |
| Desktop TBT | 0ms |
| Desktop CLS | 0 |
| Desktop SI | 0.7s |
| Mobile FCP | 1.2s |
| Mobile LCP | 2.0s |
| Mobile TBT | 0ms |
| Mobile CLS | 0.014 |
| Mobile SI | 1.9s |
Our Approach
A systematic, step-by-step process tailored to Vibeszn's needs.
Performance Audit
Identified key bottlenecks in theme code and app scripts.
Theme Optimization
Streamlined Liquid templates and reduced render-blocking resources.
App Script Management
Deferred and optimized third-party app loading.
Image Optimization
Implemented proper sizing, formats, and lazy loading.
CWV Validation
Validated improvements against real user data.
Key Takeaways
Shopify app scripts are often the biggest performance bottleneck.
Theme-level Liquid optimization delivers consistent improvements across all pages.
Mobile-first optimization is critical for e-commerce stores.
Latest Case Studies
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