Five Signs Your Shopify Site Needs a Performance Audit

Speed problems rarely arrive all at once. A new app here, a bigger hero image there, and six months later your store feels sluggish and nobody can say exactly why. These are the five signs we look for before recommending a proper audit.

1. Your mobile score has quietly dropped

Run your product page through PageSpeed Insights and compare it with a few months ago. Lab scores fluctuate, but a steady decline usually means scripts or images have been piling up. Pay most attention to the real-user field data where it's available.

2. You're failing Core Web Vitals

Google measures three things: Largest Contentful Paint (main content visible within 2.5 seconds), Interaction to Next Paint (responding to taps within 200 milliseconds) and Cumulative Layout Shift (under 0.1, so the page doesn't jump around). Failing any of them affects both search visibility and how the store feels.

3. Uninstalled apps left code behind

Many apps inject snippets into your theme and don't remove them when uninstalled. We regularly find scripts from apps that were deleted years ago, still loading on every page.

4. Images are bigger than the screen

Uploading a 4,000-pixel product photo is fine — as long as the theme serves resized versions. Old or heavily modified themes often skip responsive images, so phones download desktop-sized files. Missing width and height attributes also cause layout shift.

5. The product page does too much on load

Reviews, recommendations, wishlists, chat widgets, pop-ups, tracking pixels — all firing the moment the page opens. Most of them can wait until the customer scrolls or interacts.

What an audit covers

• A script inventory: what loads, who it belongs to and whether it's still needed.
• Image and font loading, including the hero image and above-the-fold content.
• Theme code review for render-blocking CSS and JavaScript.
• App-by-app impact, with suggestions for lighter alternatives or custom replacements.
• A prioritised list of fixes, so the biggest wins happen first.

The goal isn't a perfect score for its own sake. It's a store that loads quickly on the phones your customers actually use — because that's what turns visits into orders.