New Twiddle

controllers.application\.js

import Controller from '@ember/controller';
import { action } from '@ember/object';
import { tracked } from '@glimmer/tracking';
export default class ApplicationController extends Controller {
  @tracked
  fragment = null;
	 @tracked
	items = new Array(1000).fill(null).map((el,index)=>{
  	return {
     	time: Date.now(),
      id: index
    };
  });
	@action createRef(node) {
  	this.node = node;
    let t = Date.now();
    this.fragment = document.createDocumentFragment();
    setTimeout(()=>{
    	this.appendFragment();
          setTimeout(()=>{
            console.log(Date.now()-t);
          });
    }, 20);
  }
	@action appendFragment() {
  	this.node.appendChild(this.fragment);
  }
	@action swapItems() {
    let item1 = this.items[1];
    let item2 = this.items[4];
    this.items[1] = item2;
    this.items[4] = item1;
  	this.items = this.items;
  }
	@action onSelect() {}
	@action onRemove() {}
}

templates.application\.hbs

<button type="button" {{on "click" this.swapItems}}>Swap</button>
<table {{did-insert this.createRef}}></table>

{{#if this.fragment}}

{{#-in-element this.fragment}}
	<tbody>
	{{#each this.items key="id" as |item|}}<tr class={{if item "danger"}}><td class="col-md-1">{{item.time}}</td><td class="col-md-4"><a {{on 'click' this.onSelect}}>{{item.id}}</a></td><td class="col-md-1"><a {{on 'click' this.onRemove}}><span class="glyphicon glyphicon-remove" aria-hidden="true"></span></a></td><td class="col-md-6"></td></tr>{{/each}}
  	</tbody>

{{/-in-element}}
{{/if}}

twiddle\.json

{
  "version": "0.17.1",
  "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/3.5.1/jquery.js",
    "ember": "3.18.1",
    "ember-template-compiler": "3.18.1",
    "ember-testing": "3.18.1"
  },
  "addons": {
    "@glimmer/component": "1.0.0",
    "@ember/render-modifiers": "1.0.2",
    "ember-ref-bucket": "1.2.2"
  }
}