Theme Speed Guide · Updated March 2026

Express Theme Slow? Here's How to Fix It

Express is a free single-page Shopify theme for very small catalogs. Its minimal design makes it the fastest free theme, but it's only suitable for stores with a handful of products. Here's how to optimize it for maximum speed without sacrificing functionality.

Running the Express theme? Test your store's speed score for free →

Express Theme Overview

Developer

Shopify

Price

Free

Speed Score: Before vs After Optimization

Default (Unoptimized)

78-88

PageSpeed Mobile Score

After Optimization

93-99

PageSpeed Mobile Score

These scores represent typical ranges we see across Express stores. Your actual score depends on your specific configuration: how many products you display, which apps you've installed, your image sizes, and how many theme sections you use. A store with 5 installed apps will always be slower than one with 2 — regardless of theme choice.

Important context: Shopify's platform itself adds a baseline of JavaScript and CSS that you can't remove. This means no Shopify store will ever score a perfect 100. The scores above represent realistic, achievable targets for a well-optimized Express store with a reasonable number of apps installed.

Common Speed Issues with Express

Every Shopify theme has its own performance characteristics. Here are the speed issues we most commonly see on Express stores, along with why each one matters:

Limited to a single-page store — less applicable for larger catalogs

This is typically the largest contributor to slow Largest Contentful Paint (LCP) scores on Express stores. LCP measures how long it takes for the main visual content to appear — and it's a Core Web Vital that directly affects your Google rankings.

Single-page layout loads all content at once

Third-party scripts and render-blocking resources prevent the browser from displaying your page until they've downloaded and executed. This increases both First Contentful Paint (FCP) and Time to Interactive (TTI).

Product images for the entire catalog visible on one page

Loading too many resources eagerly (before the user scrolls to them) wastes bandwidth and competes with critical above-the-fold content for network and CPU resources.

External font loading for the minimal design

Excess DOM elements and JavaScript increase the browser's rendering workload, leading to slower interaction responsiveness (measured by Interaction to Next Paint / INP).

Step-by-Step: How to Speed Up Express

Follow these optimization steps in order — they're arranged from highest impact to lowest. Each tip is specific to the Express theme and based on patterns we see across hundreds of Express stores.

Express is already one of the fastest themes — keep your product count low (under 10) for best results

Compress all product images to WebP under 80KB — they all load on one page

Use system fonts to eliminate font loading time entirely

Avoid adding third-party apps — Express's minimal footprint is ruined by app scripts

Optimize your single hero image as the top priority — it's the LCP element

Keep product descriptions short to minimize DOM size

🔍 SEO bonus: Optimizing your Express theme's speed doesn't just improve user experience — it directly impacts your Google search rankings. Stores that pass Core Web Vitals rank higher. Speed optimization is the highest-ROI SEO investment for most Shopify stores.

The #1 Speed Factor Most Express Store Owners Miss

Here's what most speed guides won't tell you: your theme is probably not the main reason your store is slow.

The average Shopify store has 15-25 installed apps, and each one can inject JavaScript and CSS into your storefront. Review apps, email popups, chat widgets, analytics trackers, upsell tools — they all add up. On a typical Express store, third-party app scripts account for 60-80% of total JavaScript execution time.

You can optimize your Express images and settings all day, but if you have a heavy review app loading 200KB of JavaScript and a chat widget initializing a WebSocket connection on every page load, your speed score will still suffer.

This is exactly why we built Thunder. Instead of generic speed tips, Thunder scans every installed app on your store, measures each one's actual speed impact, and shows you exactly what's slowing you down. Then it automatically optimizes how those scripts load — deferring non-essential ones, reducing blocking time, and prioritizing critical functionality.

⚡ Optimize Your Express Store in 60 Seconds

Thunder automatically identifies which apps are slowing your Express store and fixes them — no code changes required. See your speed report instantly.

Install Thunder Free →

Free plan available · No theme code changes · Works with Express

Frequently Asked Questions

Why is my Express theme slow on Shopify?

The Express theme typically scores 78-88 on PageSpeed Insights out of the box. Common causes of slowness include limited to a single-page store — less applicable for larger catalogs and single-page layout loads all content at once. However, the biggest speed killer for most Express stores is third-party app scripts — review widgets, email popups, and analytics tools that load heavy JavaScript on every page. Optimizing images and deferring non-essential scripts can improve your score to 93-99.

What is a good speed score for a Express Shopify store?

For a Express store, a realistic optimized PageSpeed score is 93-99 on mobile and even higher on desktop. The default unoptimized score is typically 78-88. Don't aim for a perfect 100 — that's nearly impossible with Shopify's platform overhead and any third-party apps. A score above 80 on mobile is considered good, and anything above 90 is excellent.

How do I speed up Express without breaking my store?

Start with safe, high-impact optimizations: compress all images to WebP format, remove unused apps, and enable lazy loading in your Express theme settings. Avoid editing theme code directly unless you're comfortable with Liquid. A speed optimization app like Thunder can automatically defer third-party scripts and optimize loading order without touching your theme files — it's the safest way to improve speed.

Is Express a fast Shopify theme?

Express is a free Shopify theme that performs reasonably well out of the box, typically scoring 78-88 on mobile PageSpeed. As a Shopify-built theme, it follows modern performance practices. However, your actual speed depends heavily on your product images, installed apps, and how many sections you use. With optimization, Express stores can reach 93-99.