Are Shopify Apps Slowing Down Your Store? How to Find and Fix the Culprits

How apps slow a store down

• They load JavaScript and CSS on your storefront, sometimes on every page.
• They make additional network requests to third-party servers.
• Some inject code into the theme that stays behind after you uninstall.
• They can shift layout as widgets load late.

Find the culprits

1. List every installed app and note what it does and how often it is used.
2. Run PageSpeed Insights on key pages and open the diagnostics that list third-party code and long tasks.
3. In a duplicate theme, disable app embeds one at a time and retest to see the effect of each.
4. Rank apps by cost versus value.

Clean up properly

• Uninstall apps you no longer use.
• Search theme files for leftover snippets, includes and script tags from removed apps, and delete them in a duplicate theme first.
• Turn off app embeds you are not using.
• Check the theme for duplicate libraries, such as several apps each loading the same script.

Choose lighter options

• Prefer apps that use theme app extensions and load only where needed.
• Replace simple apps (announcement bars, badges, basic popups) with native theme sections.
• Ask vendors what their app adds to page weight before installing.
• Test speed before and after every new app.

We audit this for stores in our app speed optimisation work, and the wider picture is in our Core Web Vitals guide.

Frequently asked questions

Do Shopify apps slow down my store?

Many do, by adding scripts, styles and requests. The impact varies by app, so test speed before and after installing.

Does uninstalling a Shopify app remove its code?

Not always. Some apps leave snippets or script tags in your theme, so check the theme files after uninstalling and remove leftovers carefully.

How many apps is too many on Shopify?

There is no fixed number. What matters is the total load and value of each app, so measure the impact rather than counting them.