ember table

components.table\.js

import Component from '@glimmer/component';
import { action } from '@ember/object';

export default class extends Component {
  constructor(owner, args) {
    super(owner, args);
    
    console.time('table');
  }
  
  @action
  onDidInsert() {
    console.timeEnd('table');
  } 

}

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

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

templates.components.table\.hbs

<table>
  <tbody>
    {{#each @data as |datum|}}
      <tr>
        {{#each @columns as |column|}}
          <td>
            {{get datum column}}
          </td>
        {{/each}}
      </tr>
    {{/each}}
  </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"
  }
}