Does page speed affect sales? How to speed up your online store
Slow pages lose shoppers before they see your products. What PageSpeed scores mean, what usually slows stores down, and fixes you can make without a developer.
Yes: every extra second before a page is usable gives visitors another chance to leave, and phones on mobile data feel it most. Most online stores are slowed down by large images, too many apps or plugins adding scripts, heavy themes and autoplay videos. Start by compressing images, removing apps you don't use, and checking your mobile score in Google PageSpeed Insights after each change.
- Check your mobile score in PageSpeed Insights, not just desktop.
- Large images and unused apps are the most common causes of slow stores.
- Every app or plugin that adds a script to your storefront has a cost. Remove the ones you don't need.
- Fix what visitors notice first: how quickly the main content appears and whether the layout jumps.
What the PageSpeed numbers mean
Google PageSpeed Insights gives a performance score from 0 to 100 and several measurements. The ones that matter most for shoppers:
| Metric | What it measures |
|---|---|
| Largest Contentful Paint (LCP) | How long until the main content, such as the hero image, appears |
| First Contentful Paint (FCP) | How long until anything appears at all |
| Cumulative Layout Shift (CLS) | How much the page jumps around while it loads |
| Total Blocking Time (TBT) | How long scripts stop the page from responding to taps |
The mobile score is usually much lower than desktop, because it simulates a mid-range phone on a slower connection. That's closer to what many of your visitors experience.
What usually slows stores down
- Large images: photos uploaded straight from a camera, several megabytes each.
- Apps and plugins: reviews, pop-ups, chat, upsells and tracking, each adding its own scripts.
- Autoplay video in the hero.
- Heavy themes with lots of animation and sections.
- Leftover code from apps you uninstalled.
Fixes you can make yourself
- 1Compress and resize images before uploading. Most product photos don't need to be wider than about 2000 pixels.
- 2List every app or plugin you have installed and remove the ones you don't actively use.
- 3Replace an autoplay hero video with a strong image, or load the video only after the page has appeared.
- 4Remove sections you don't need from your homepage: each one adds weight.
- 5Re-test in PageSpeed Insights after each change, so you know what helped.
Don't chase a perfect score
A score of 100 isn't the goal; shoppers seeing your products quickly is. A store with a clear, fast first screen and a score in the 50s or 60s can sell better than a stripped-down store with a perfect score. Fix the big problems, then spend your time on the rest of the shopping experience.
Every StorePeek audit includes your Google PageSpeed score and Core Web Vitals alongside the conversion review. Check your store free.
Frequently asked questions
What is a good PageSpeed score for an online store?
Google considers 90 and above good, 50 to 89 needs improvement, and below 50 poor. Many real stores score lower on mobile because of apps and images; aim to improve your own score rather than hitting a specific number.
Why is my mobile score so much lower than desktop?
The mobile test simulates a slower phone and connection. Scripts and large images that load quickly on a laptop take much longer there.
Do I need a developer to speed up my store?
Not for the basics. Compressing images, removing unused apps and simplifying your homepage are things most store owners can do themselves. Deeper theme work is where a developer helps.