Render Template From DOM Select vs Cache vs HTML Cache

JavaScript performance comparison

Revision 2 of this test case created by Jay Cox

Info

This test was spawned by some discussion in a StackOverflow thread:

http://stackoverflow.com/questions/9833312/how-do-i-properly-store-a-javascript-template-so-that-it-isnt-instantiated-mul

The purpose is to test the speed of rendering an underscore.js template when selecting the template from the DOM every time, vs selecting it once and re-rendering the cached template every time.

Preparation code

<script id="test-template" type="text/template">
  < p > this is < div class = "foo" > some html < /div>
  </p > < ul > < li > with data < li > and items < li > etc < /ul>
</script>
<script src="//ajax.googleapis.com/ajax/libs/jquery/1/jquery.min.js">
</script>
<script src="//documentcloud.github.com/underscore/underscore-min.js">
</script>
<div id="html-output-goes-here">
</div>
<script>
Benchmark.prototype.setup = function() {
    this.cachedItem = $("#test-template");
    this.cachedHtml = this.cachedItem.html()
    this.cachedTemplate = _.template(this.cachedHtml);
    this.output = $("#html-output-goes-here");
};

Benchmark.prototype.teardown = function() {
    delete this.cachedItem;
    delete this.cachedTemplate;
};
</script>

Preparation code output

Test runner

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Testing in unknown unknown
Test Ops/sec
Template-Cached
var html = this.cachedTemplate();
this.output.html(html);
pending…
Non-Cached
var uncachedItem = $("#test-template");
var uncachedTemplate = _.template(uncachedItem.html());
var html = uncachedTemplate();
this.output.html(html);
pending…
DOM-Item-Cached
var itemCachedTemplate = _.template(this.cachedItem.html());
var html = itemCachedTemplate();
this.output.html(html);
pending…
Html-Cached
var itemCachedTemplate = _.template(this.cachedHtml);
var html = itemCachedTemplate();
this.output.html(html);
pending…

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