This visualization shows a time series of page load performance metrics, displaying percentile bands (5–95% and 25–75%) as shaded areas alongside a bold median line. Animated circular markers highlight specific events—client releases and server versions—that slide upward from the chart’s baseline. Built with React and D3.js, the code uses `d3.svg.area()` and `d3.svg.line()` with basis interpolation to render smooth paths, while `transition()` animates marker positions. The data is loaded from JSON files containing daily percentile values and event annotations.