code: function drawChart(chart) {
  	var streaming = chart.streaming;
  	var frameRate = chart.options.plugins.streaming.frameRate;
  	var frameDuration = 1000 / (Math.max(frameRate, 0) || 30);
  	var next = streaming.lastDrawn + frameDuration || 0;
  	var now = Date.now();
  	var lastMouseEvent = streaming.lastMouseEvent;
  
  	if (next <= now) {
  		// Draw only when animation is inactive
  		if (!chart.animating && !chart.tooltip._start) {
  			chart.draw();
  		}
  		if (lastMouseEvent) {
  			chart.eventHandler(lastMouseEvent);
  		}
  		streaming.lastDrawn = (next + frameDuration > now) ? next : now;
  	}
  }
docs: Draw chart at frameRate