How to improve website speed shopify

Shopify's default setup prioritizes ease of use over performance, which means most stores ship with unnecessary bloat. The fastest wins come from image optimization and reducing unused apps and code. Compress all product images to WebP format before uploading—Shopify automatically serves these to compatible browsers, but you need to provide them first. Use a tool like TinyPNG or Squoosh to batch-process images before upload. Remove any apps you're not actively using, since every app injects JavaScript and CSS into your theme. Even seemingly lightweight apps add 50-200KB. In your Shopify admin, audit installed apps by reviewing your theme code—go to Online Store > Themes > Edit Code and check the `theme.liquid` file for script tags. Delete unused third-party integrations entirely. For critical apps you must keep, contact developers about async loading options or whether they offer lighter alternatives.

Your theme itself matters significantly. Pre-built Shopify themes vary wildly in performance. If you're working with clients on slow themes, consider recommending modern alternatives like Impulse, Supply, or Debut's successor Prestige, which were built with Core Web Vitals in mind. If changing themes isn't practical, disable unused sections within theme settings—every feature you don't use is dead weight. Use Shopify's native lazy loading for product images by enabling it in theme settings rather than installing a separate lazy load app. Enable Shopify's built-in content delivery network (CDN) for assets, which is automatic but verify it's working by checking image URLs in your source code—they should point to `cdn.shopify.com`.

For deeper optimization, Liquid code matters. Reduce the number of API calls in your product templates, particularly on collection pages where you might be fetching related products. Use Shopify's Predictive Search feature instead of custom search solutions when possible. Finally, use Google PageSpeed Insights and WebPageTest to identify specific bottlenecks for your clients' stores. Shopify PageSpeed scores often lag competitors because of their checkout complexity, which you can't control, but you can definitely improve everything else. Most clients see 2-4 second load time improvements by combining image optimization, app cleanup, and theme switching.