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                <div style="display: grid; grid-template-columns: 1fr 1fr 1fr">
  <div id='plot1' class='plot'></div>
  <div id='plot2' class='plot'></div>
  <div id='plot3' class='plot'></div>
  <div id='plot4' class='plot'></div>
  <div id='plot5' class='plot'></div>
  <div id='plot6' class='plot'></div>
  <div id='plot7' class='plot'></div>
  <div id='plot8' class='plot'></div>
  <div id='plot9' class='plot'></div>


                .plot {
  height: 250px;


                let x = [];
let y = [];
let n = 3e3;

for (let i = 0; i < n; i++) {
  let f = Math.random();

let traces = [{
  x: x,
  y: y,
  type: 'scatter',
  mode: 'markers'

let layout = {
  margin: {
    l: 25,
    r: 25,
    t: 25,
    b: 25

plotGroups(1, 9, 3);

async function plotGroups(plotNum, totalPlots, groupSize) {
  //return if done
  if ((plotNum + groupSize) > (totalPlots + 1)) {
  //make array of promises and wait for all to resolve
  let reqs = [];
  for (let i = 0; i < groupSize; i++) {
    reqs.push(Plotly.react('plot' + (plotNum + i).toString(), traces, layout));
  await Promise.all(reqs);
  //call recursively with next set
  setTimeout(function() { plotGroups(plotNum + groupSize, totalPlots, groupSize) }, 10);