New Twiddle

components.article-list\.js

import Component from '@glimmer/component';

export default class extends Component {
  
  items = this.generateItems();

	get generateItems() {
  	const items = [];
    for(x=0; x<=1000; x++){
    	items.push({row: x, columns: [
        {columnName: "one"},
        {columnName: "two"},
        {columnName: "three"},
        {columnName: "four"},
        {columnName: "five"},
        {columnName: "six"},
        {columnName: "seven"},
        {columnName: "eight"},
        {columnName: "nine"},
      ]});
      return items;
    }
  }
}

controllers.application\.js

import Controller from '@ember/controller';

export default class ApplicationController extends Controller {
  appName = 'Ember Twiddle';
}

templates.application\.hbs

<h1>Table render performance</h1>
<br>
<br>
<ArticleList />
<br>
<br>

templates.components.article-list\.hbs

{{"=hello"}}
<table>
{{#each this.items as |item|}}
{{log item}} 
	<tr>
  {{#each item.columns as |column|}}
  {{log column}}
  	<td>
    	{{column.columnName}}
    </td>
    {{/each}}
  </tr>
{{/each}}
</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": "3.17.0",
    "ember-template-compiler": "3.17.0",
    "ember-testing": "3.17.0"
  },
  "addons": {
    "@glimmer/component": "1.0.0"
  }
}