Page Speed Checklist — Performance Optimization

Interactive checklist for optimizing website page speed. Core Web Vitals recommendations.

CSS & JS

Minify CSS

Remove whitespace and comments from CSS files.

Minify JavaScript

Compress JS files to reduce file size.

Remove unused CSS

Eliminate CSS rules that are not used on the page.

Defer non-critical JS

Use defer/async attributes for non-essential scripts.

Images

Optimize images

Compress images without losing quality (WebP, AVIF).

Lazy load images

Load images only when they enter the viewport.

Use responsive images

Serve appropriately sized images with srcset.

Server

Enable Gzip/Brotli compression

Compress server responses to reduce transfer size.

Leverage browser caching

Set appropriate Cache-Control headers.

Use a CDN

Serve assets from a Content Delivery Network.

Enable HTTP/2

Use HTTP/2 for faster parallel resource loading.

Performance

Preconnect to origins

Use <link rel='preconnect'> for third-party domains.

Preload critical fonts

Use <link rel='preload'> for above-the-fold fonts.

Inline critical CSS

Inline above-the-fold CSS to speed up first paint.

Reduce redirects

Minimize redirect chains that add latency.

Fonts

Optimize web fonts

Use font-display: swap and subset fonts.

Use modern font formats

Use WOFF2 for better compression.

DOM

Reduce DOM size

Keep the DOM under 1500 nodes for better performance.

Avoid layout shifts

Set dimensions on images/embeds to prevent CLS.

Rendering

Use server-side rendering

Serve pre-rendered HTML for faster FCP.

Frequently Asked Questions

How do I use Page Speed Checklist?

Enter your website URL. The tool runs a set of performance checks and shows you which optimizations are passing or failing.

Is Page Speed Checklist free?

Yes, Page Speed Checklist on ToolPix is 100% free with no signup or installation required.

Is my data safe?

All processing happens in your browser, your data never leaves your device.

What checks are included?

Image optimization, render-blocking resources, minification, caching headers, HTTPS, Core Web Vitals, and more.

How does page speed affect SEO?

Page speed is a confirmed Google ranking factor. Faster pages rank higher and have lower bounce rates.

Page Speed Checklist — Performance Optimization

CSS & JS

Images

Server

Performance

Fonts

DOM

Rendering

Frequently Asked Questions

Related Tools

CSS & JS

Images

Server

Performance

Fonts

DOM

Rendering