Speed matters because most of your customers shop on their phones, often on a weak connection. If pages are slow to appear or jump around while they load, people leave. The good news is that most Shopify stores can get noticeably faster without a rebuild.
Start by measuring
Run your homepage, a collection page and a product page through Google's PageSpeed Insights, and check the Core Web Vitals report in Google Search Console. Focus on the mobile results. Write down the scores so you can see what each change achieves.
1. Audit your apps
Every app that adds something to your storefront usually adds code that every visitor has to download. Go through your installed apps and ask whether each one still earns its place. Remove the ones you no longer use, and check that uninstalled apps have not left code behind in your theme.
2. Size your images properly
Large images are the most common cause of slow pages. Upload images at sensible sizes, use your theme's responsive image settings so phones get smaller files, and avoid huge banner images where a smaller one would do.
3. Be careful with video
Background videos look great but are heavy. Keep them short, compress them well, and make sure they do not load before the visitor needs them.
4. Cut back third-party scripts
Chat widgets, review carousels, pop-ups and tracking pixels all add weight. Load what you can through a tag manager, delay anything that is not needed straight away, and remove tags for tools you no longer use.
5. Keep fonts lean
Each font and weight is another file to download. Two families, with only the weights you actually use, is plenty for most brands.
6. Use a modern, well-built theme
If your theme is several years old or heavily patched, a modern Online Store 2.0 theme or a custom build may be the bigger win. A clean foundation stays fast as you add features, instead of slowing down a little more with every change.
Keep it fast
Speed is not a one-off job. Check your scores every month and after every new app or campaign, so small slowdowns do not pile up.