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Optimizing Store Performance: A Complete Guide

· 2 min read
Tanqory Team
Tanqory Team
Development Team @ Tanqory

Speed matters. Learn how to optimize your store for maximum performance and better conversion rates.

Why Performance Matters​

Studies show that:

  • 53% of mobile users abandon sites that take longer than 3 seconds to load
  • A 1-second delay can reduce conversions by 7%
  • Google uses page speed as a ranking factor

Quick Wins​

1. Optimize Images​

Images are often the largest assets on a page. Here's how to optimize them:

// Use modern image formats
const imageFormats = {
  preferred: 'webp',
  fallback: 'jpg',
  icons: 'svg'
};

// Implement lazy loading
<img
  src="placeholder.jpg"
  data-src="actual-image.webp"
  loading="lazy"
  alt="Product image"
/>

Tips:

  • Use WebP format (30% smaller than JPEG)
  • Implement lazy loading for below-the-fold images
  • Serve appropriately sized images using srcset

2. Minimize JavaScript​

// Bad: Loading everything upfront
import { everything } from 'heavy-library';

// Good: Dynamic imports
const module = await import('heavy-library');

3. Optimize CSS​

/* Use CSS containment */
.product-card {
  contain: layout style paint;
}

/* Avoid expensive selectors */
/* Bad */
.container > div > ul > li > a { }

/* Good */
.nav-link { }

Advanced Techniques​

Critical CSS​

Extract and inline critical CSS for faster first paint:

<head>
  <style>
    /* Critical CSS inlined here */
    .header { /* styles */ }
    .hero { /* styles */ }
  </style>
  <link rel="preload" href="main.css" as="style">
  <link rel="stylesheet" href="main.css" media="print" onload="this.media='all'">
</head>

Resource Hints​

<!-- Preconnect to important origins -->
<link rel="preconnect" href="https://fonts.googleapis.com">
<link rel="preconnect" href="https://cdn.tanqory.com">

<!-- Prefetch next page -->
<link rel="prefetch" href="/products">

<!-- Preload critical resources -->
<link rel="preload" href="hero-image.webp" as="image">

Service Workers​

Implement caching for repeat visitors:

// sw.js
const CACHE_NAME = 'tanqory-v1';
const urlsToCache = [
  '/',
  '/styles/main.css',
  '/scripts/main.js'
];

self.addEventListener('install', event => {
  event.waitUntil(
    caches.open(CACHE_NAME)
      .then(cache => cache.addAll(urlsToCache))
  );
});

Measuring Performance​

Use these tools to measure your improvements:

ToolWhat it measures
LighthouseOverall performance score
WebPageTestReal-world loading
Core Web VitalsLCP, FID, CLS

Key Metrics to Track​

  • LCP (Largest Contentful Paint): < 2.5s
  • FID (First Input Delay): < 100ms
  • CLS (Cumulative Layout Shift): < 0.1

Performance Checklist​

  • Compress and optimize images
  • Enable GZIP/Brotli compression
  • Minify CSS and JavaScript
  • Implement lazy loading
  • Use a CDN
  • Enable browser caching
  • Remove unused code
  • Optimize web fonts

Conclusion​

Performance optimization is an ongoing process. Start with the quick wins, measure your results, and iterate. Your customers (and search rankings) will thank you.

Need help optimizing your store? Contact our team for a free performance audit.