paulirish

paulirish/speedline

Calculate the speed index from devtools performance trace

JavaScript
806
48
MIT License

Speedline is a tool that calculates the Speed Index from Chrome DevTools performance traces, measuring how fast page content is visually displayed to users. It's designed for web developers and performance engineers who want to analyze and optimize the visual loading experience of their websites. The tool provides both the original Speed Index and a perceptual variant using SSIM for more accurate visual progress measurement.

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