TODO

Features

• Wait for the last HTTP request to complete (aka post window.onload activity)
• Emit an event on JavaScript error
• Benchmark reflows and repaints
• Export to HAR format + metric naming convention after HTTP Archive format

Metrics

• Number of POST requests
• Tracking services
• Not cached assets
• HTML comments length
• Number of inline script tags
• CSS complexity (number and complexity of selectors)
• Use of localStorage vs cookies
• Size of HTML hidden in CSS (display:none) on page load
• Number of DOM queries (via document.getElementById, document.getElementsByTagName and jQuery)
• Size of text nodes containing whitespaces only (i.e. the "cost" of formatted HTML)
• Number of cache (Varnish, Squid) hits and misses

Suggestions

• Use Content Delivery Network
• Use base64 encoding for small images
• Don't use query string (?foo=bar) in URLs to static assets + check caching TTL
• Repeated DOM queries (for the same selectors)