Why Your Shopify Store Is Slow and What to Fix First

You can't upgrade the server on Shopify, and you don't need to. The platform handles hosting and its CDN. So when a store is slow, the cause is almost always something added on top, and that makes it fixable.

First, measure the right pages

Most people test the homepage on a laptop. Shoppers land on product and collection pages on their phones. Test those on mobile using our free audit, and check the web performance report under Analytics in your Shopify admin. Note your numbers before you change anything, so you can tell what worked. If the terms are new to you, read Core Web Vitals explained.

Fix these in order

1. Audit your apps

Many apps add JavaScript to every page, including pages where they do nothing. List each one and ask whether it has earned its place this quarter. Uninstall what you don't use, then check your theme files, since removed apps can leave code behind.

2. Compress and resize images

Upload images at a sensible size, not straight from the camera. Check that your theme loads the right size for each screen, and that only images below the first screen are lazy-loaded.

3. Simplify the top of the page

Autoplay video and multi-slide carousels are expensive, and they're usually the largest thing the browser has to load first. One strong image and a clear headline load faster and are easier to read.

4. Prune tracking scripts

Pixels, heatmaps, review widgets and chat tools add up. Remove duplicates, such as a pixel installed by hand and again by an app. Use Shopify's built-in integrations where they exist, instead of pasting code into the theme.

5. Look at the theme

Themes built to do everything load everything. If the earlier fixes didn't get you far enough, test a current lightweight theme on an unpublished copy and compare. Check speed before you buy a theme, not after.

6. Keep product pages tidy

Size charts, review carousels, upsell blocks and countdown timers each add weight. Keep the ones that help people decide, and load the rest once the shopper reaches them.

When to bring in a developer

Apps and images are usually within a store owner's reach. It's time for a developer when the theme's code needs changing, when scripts have to be delayed safely without breaking tracking, or when old app code is tangled through your templates. Our performance team does this work.

If you've outgrown the platform itself, custom e-commerce vs Shopify covers when moving makes sense. Often it doesn't, and a cleanup is enough. You can also add up your monthly app bill on our alternatives page.

Frequently Asked Questions

Do speed-booster apps work?

Some help with images or delaying scripts, but each one is another app. Remove the apps you don't need first, then see whether you still need one.

Will changing theme lose my content?

Products and orders stay put, but theme settings and customisations don't always carry over. Work on an unpublished copy and check it before going live.

How fast should my store be?

Aim for the "good" Core Web Vitals scores on mobile: a main content load of 2.5 seconds or less is the one most stores struggle with.