Shopify Performance Optimization Checklist: A Practical Guide for Faster Stores

Introduction

A slow Shopify store can hurt conversions, increase bounce rates, and create a frustrating shopping experience.

The good news is that most performance issues come from a few common areas, such as heavy themes, oversized images, unnecessary apps, and poorly optimized scripts.

This checklist provides a practical framework for reviewing and improving your Shopify store's performance.

When Should You Use This Checklist?

This checklist is useful if:

• Your store feels slow on mobile devices

• Google PageSpeed Insights shows poor scores

• Core Web Vitals metrics need improvement

• You have installed many apps over time

• Customers are experiencing slow page loads or delayed interactions

• You want to improve user experience and conversion rates

Shopify Performance Optimization Checklist

Performance Audit

• Run Google PageSpeed Insights

• Run Lighthouse Audit

• Test Homepage, Product Pages, Collection Pages, Cart Page, and Blog Pages

• Review LCP, CLS, and INP scores

• Check Shopify Performance Reports

• Identify large resources and third party scripts

Theme Optimization

• Use a Shopify OS 2.0 theme

• Remove unused sections and templates

• Remove unused snippets

• Clean redundant CSS

• Remove duplicate JavaScript

• Remove leftover app code

JavaScript Optimization

• Add defer to non critical scripts

• Delay third party scripts when possible

• Remove duplicate libraries

• Reduce overall JavaScript size

• Avoid multiple slider libraries

Image Optimization

• Use WebP images

• Use AVIF when supported

• Compress images before uploading

• Output properly sized Shopify images

• Define image dimensions

• Enable lazy loading for below the fold images

• Optimize hero banners separately

Above the Fold Optimization

• Preload hero images

• Preload the primary font

• Preload critical CSS

• Add preconnect for Shopify CDN and fonts

App Cleanup

• Remove unused apps

• Remove duplicate functionality apps

• Review third party scripts

• Keep only one performance optimization app

Page Structure Optimization

• Simplify homepage layout

• Reduce unnecessary sliders

• Avoid autoplay background videos

• Enable collection pagination

• Fix broken links and missing resources

CLS Optimization

• Reserve space for images

• Reserve space for videos and iframes

• Reserve space for review widgets

• Avoid injecting content above existing content

• Use skeleton loading placeholders

INP Optimization

• Reduce long JavaScript tasks

• Optimize variant selection

• Optimize cart updates

• Optimize collection filters

• Use throttling and debouncing where appropriate

• Reduce unnecessary DOM updates

Font Optimization

• Limit font families

• Limit font weights

• Use font-display: swap

• Prefer Shopify hosted or system fonts

• Reduce external font requests

Mobile Optimization

• Hide non essential mobile elements

• Reduce heavy animations

• Disable unnecessary parallax effects

• Improve mobile button usability

• Review popup behavior on mobile

DOM & Rendering Optimization

• Reduce DOM size

• Avoid deep HTML nesting

• Remove unnecessary wrappers

• Load sections only when needed

• Split large code bundles when possible

Third Party Script Management

• Load only essential scripts immediately

• Delay chat widgets

• Delay review applications

• Delay analytics and tracking scripts

• Delay marketing and testing tools

Performance Validation

• Re run Lighthouse

• Re run PageSpeed Insights

• Verify LCP ≤ 2.5s

• Verify CLS < 0.1

• Verify INP ≤ 200ms

Business Benefits

Following this checklist can help create a faster, smoother shopping experience for your customers.

Benefits may include:

• Better Core Web Vitals scores

• Faster page loading

• Improved mobile experience

• Reduced bounce rates

• Higher conversion potential

• Easier long term store maintenance