fast table

components.fast-table\.js

import Component from '@glimmer/component'
import { inject as service } from '@ember/service';
import { get, computed } from '@ember/object';

export default class FastTable extends Component {
  get tbody() {
    const data = this.args.data;
    const tbodyFragment = document.createDocumentFragment();
    const tbody = document.createElement('tbody');

    for (let index = 0; index < data.length; index++) {
      const trFragment = document.createDocumentFragment();
      const tr = document.createElement('tr');
      const datum = data[index];

      for (let column of this.args.columns) {
        let value = get(datum, column);
        const td = document.createElement('td');

        td.appendChild(document.createTextNode(value));
        
        trFragment.appendChild(td);
      }

      tr.appendChild(trFragment);
      tbodyFragment.appendChild(tr);
    }

    tbody.appendChild(tbodyFragment);
    return tbody;
  }
}

controllers.application\.js

import Controller from '@ember/controller';

export default class ApplicationController extends Controller {
  columns = ['id', 'first', 'last', 'number', 'age'];
  data = Array(50000).fill(null).map( (x,i) => {
    const datum = {};
    this.columns.forEach((column) => {
      datum[column] = i;
    });
    return datum; 
  });
}

templates.application\.hbs

<FastTable
  @data={{this.data}}
  @columns={{this.columns}}
/>

templates.components.fast-table\.hbs

<table>
  {{this.tbody}}
</table>

twiddle\.json

{
  "version": "0.17.0",
  "EmberENV": {
    "FEATURES": {},
    "_TEMPLATE_ONLY_GLIMMER_COMPONENTS": false,
    "_APPLICATION_TEMPLATE_WRAPPER": true,
    "_JQUERY_INTEGRATION": true
  },
  "options": {
    "use_pods": false,
    "enable-testing": false
  },
  "dependencies": {
    "jquery": "https://cdnjs.cloudflare.com/ajax/libs/jquery/3.3.1/jquery.js",
    "ember": "3.16.3",
    "ember-template-compiler": "3.16.3",
    "ember-testing": "3.16.3"
  },
  "addons": {
    "@glimmer/component": "1.0.0",
    "ember-data": "3.16.2"
  }
}