Discover the top optimization techniques our engineers use to score 100 on Lighthouse.
In an era where attention spans are plummeting and mobile devices dominate, having a fast website is no longer a luxury—it is a critical business asset. Here are five strategies our engineers recommend for perfect Lighthouse scores.
### 1. Optimise and Compress Images
Images often make up the bulk of a web page's weight. By serving images in next-gen formats like WebP or AVIF, and ensuring they are properly sized for the user's viewport, you can massively drop your initial load time.
### 2. Leverage a Content Delivery Network (CDN)
If your server is in New York, a user in Tokyo will inherently experience latency. A CDN distributes your static assets (CSS, JS, images) across hundreds of servers globally, so users download them from the node closest to them.
> "Performance is unequivocally tied to business revenue. A one-second delay in page load time can yield a 7% reduction in conversions."
### 3. Minify CSS, JavaScript, and HTML
Minification removes unnecessary spaces, line breaks, and comments from your code during the build step. Although it seems minor, shaving off kilobytes across multiple files makes parsing significantly faster for the browser.
### 4. Implement Lazy Loading
Don't force the browser to render images or videos that are far below the fold. Lazy loading ensures that heavy assets are only fetched from the network when the user actually scrolls down to them.
### 5. Upgrade Your Caching Strategy
Aggressive caching policies guarantee that returning visitors don't have to re-download unchanged static assets. Pairing a robust server-level cache (like Redis) with aggressive browser caching headers leads to instantaneous repeat views.
### 1. Optimise and Compress Images
Images often make up the bulk of a web page's weight. By serving images in next-gen formats like WebP or AVIF, and ensuring they are properly sized for the user's viewport, you can massively drop your initial load time.
### 2. Leverage a Content Delivery Network (CDN)
If your server is in New York, a user in Tokyo will inherently experience latency. A CDN distributes your static assets (CSS, JS, images) across hundreds of servers globally, so users download them from the node closest to them.
> "Performance is unequivocally tied to business revenue. A one-second delay in page load time can yield a 7% reduction in conversions."
### 3. Minify CSS, JavaScript, and HTML
Minification removes unnecessary spaces, line breaks, and comments from your code during the build step. Although it seems minor, shaving off kilobytes across multiple files makes parsing significantly faster for the browser.
### 4. Implement Lazy Loading
Don't force the browser to render images or videos that are far below the fold. Lazy loading ensures that heavy assets are only fetched from the network when the user actually scrolls down to them.
### 5. Upgrade Your Caching Strategy
Aggressive caching policies guarantee that returning visitors don't have to re-download unchanged static assets. Pairing a robust server-level cache (like Redis) with aggressive browser caching headers leads to instantaneous repeat views.