Animating Circles (D3 & SVG)

Animation with D3 and SVG. Runs with 18 – 20 FPS on a Retina MBP 13".

<!DOCTYPE html>
<meta charset="utf-8">
<style>
body {
  font-family: Helvetica, sans-serif;
}
svg {
  position: absolute;
  top: 0;
  left: 0;
  z-index: -1;
}
.filter-btn.active {
  font-weight: bold;
}
</style>
<body>
<script src="https://d3js.org/d3.v3.min.js"></script>
<script src="d3-grid.js"></script>
<script>

var width = 960,
    height = 960
    TAU = Math.PI * 2;

var grid = d3.layout.grid()
  .size([width, height]);

var color = d3.scale.linear()
  .interpolate(d3.interpolateHcl)
  .domain([0, 100])
  .range(["#F66A96", "#3E6E9C"]);

var data = d3.range(5000).map(function(d) { 
  return {
    id: d,
    size: 1 + Math.floor(Math.random() * 5),
    r: Math.random() * 50,
    color: Math.floor(Math.random() * 100),
    f: (Math.random() > 0.5 ? -1 : 1) * (Math.random() * 10000 + 1000)
  }; 
});

var svg = d3.select("body").append("svg")
  .attr({
    width: width,
    height: height
  })
.append("g")
  .attr("transform", "translate(0,0)");

function update(t) {
  node.attr("transform", function(d) {
    var alpha = TAU / d.f * (t % d.f);
    return "translate(" + (d.x + Math.cos(alpha) * d.r) + "," + (d.y + Math.sin(alpha) * d.r) + ")";
  });
}

d3.timer(update);

d3.select(self.frameElement).style("height", height + "px");

</script>

Modified http://d3js.org/d3.v3.min.js to a secure url

https://d3js.org/d3.v3.min.js