Renderer performance test

spec.json

{
  "$schema": "https://vega.github.io/schema/vega/v5.json",
  "description": "An animated scatterplot with N points",
  "width": 500,
  "height": 300,
  "autosize": "none",
  "signals": [
    {
      "name": "t",
      "value": 0,
      "on": [
        {
          "events": {"type": "timer", "throttle": 33},
          "update": "(now() / 1000)"
        }
      ]
    },
    {
      "name": "N",
      "value": 1000,
      "bind": {"input": "range", "min": 10, "max": 10000}
    }
  ],
  "data": [
    {
      "name": "points",
      "transform": [
        {"type": "sequence", "start": 0, "stop": {"signal": "N"}},
        {"type": "formula", "expr": "random() * 3.1415926", "as": "u"},
        {"type": "formula", "expr": "random() * 3.1415926", "as": "v"}
      ]
    }
  ],
  "marks": [
    {
      "type": "symbol",
      "from": {"data": "points"},
      "clip": true,
      "encode": {
        "enter": {
          "fillOpacity": {"value": 0.1},
          "fill": {"value": "#1f77b4"},
          "size": {"value": 10}
        },
        "update": {
          "x": {
            "signal": "(cos(datum.v + t * 2.1) + sin(datum.u + t)) / 2 * 250 + 250"
          },
          "y": {
            "signal": "(cos(datum.v + t) + sin(datum.u + t * 3.3)) / 2 * 150 + 150"
          }
        }
      }
    }
  ]
}