Compression
Quick Definition
Compression in SEO refers to reducing the file size of web resources like HTML, CSS, JavaScript, and images using methods like Gzip or Brotli. Compression speeds up page loading and improves Core Web Vitals scores.
Why It Matters
Compression can reduce file transfer sizes by 60-80%, making pages load significantly faster (Google, 2024). It is one of the easiest speed wins because most web servers support it with a simple configuration change. Faster pages mean better Core Web Vitals scores and improved rankings.
Real-World Example
A 500KB HTML page compressed with Brotli becomes roughly 80KB during transfer. The browser automatically decompresses it. The user sees the same page, but it downloaded 6x faster. This is why almost every major website including Google, Amazon, and Flipkart uses compression.
Signal Connection
Momentum -- Compression is a one-time setup that continuously improves page speed for every visitor. Once enabled, every page on your site benefits, creating sustained positive momentum in your speed metrics and user experience.
Pro Tip
Check if your site uses compression by visiting your page in Chrome, pressing F12, going to the Network tab, and looking for 'content-encoding: br' (Brotli) or 'content-encoding: gzip' in the response headers. If neither appears, enable compression on your server immediately.
Common Mistake
Not knowing the difference between Gzip and Brotli. Brotli (developed by Google) provides 15-20% better compression than Gzip and is supported by all modern browsers. If your server supports it, always prefer Brotli over Gzip.
Test Your Knowledge
Which compression method provides better compression ratios for web content?
Show Answer
Answer: B. Brotli
Brotli, developed by Google, provides 15-20% better compression than Gzip for web content. It is supported by all modern browsers and is the recommended compression method for websites focused on performance.