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<article id="article-body" data-attribute="article-content-body" class="n-content-body js-article__content-body"><figure class="n-content-image n-content-image--full"><picture><source media="(min-width: 980px)" srcset="https://d1e00ek4ebabms.cloudfront.net/production/a23aece0-5847-4985-be27-9ac69526ad33.jpg 2x" width="4000" height="2667"><img src="https://d1e00ek4ebabms.cloudfront.net/production/4bdcd132-66c1-4e05-afe0-41081ec7c91a.jpg" alt="Jan Kameníček, CEO of Raylyst Solar, a Prague-based distributor of photovoltaic products, stands by a solar panel" data-image-type="image" width="5151" height="3434" loading="lazy"></picture><figcaption class="n-content-picture__caption"><span>Raylyst Solar, a Prague-based distributor of solar panels and other photovoltaic products, tops the FT 1000 ranking of Europe’s fastest-growing companies this year. Chief executive Jan Kameníček is pictured</span><span> </span></figcaption></figure><p>This year’s FT-Statista annual ranking of Europe’s fastest-growing companies refle

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! 12/10/2019 https://twitter.com
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! 12/10/2019 https://github.com
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! 12/10/2019 https://www.instagram.com

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(function() {
  //The below is a slightly modified version of https://github.com/sitexw/BlockAdBlock
  var BlockAdBlock = function() {
  	this._options = {
  		resetOnEnd: true,
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<nav class="nav">
  <ul>
    <li class="nav__item">
      <a href="#" class="nav__item__link">The Workshop</a>
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      <a href="#" class="nav__item__link">2013 Schedule</a>
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      <a href="#" class="nav__item__link">About CSSWizardry</a>

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• Node http uses dns.lookup behind the scenes

• dns.lookup = uses OS facilities i.e. should be same as ping/wget etc

• dns.resolve = gets from network, ignores OS config

• both have options to force IPv4

• dns.lookup seems to cache (presumably OS cache) i.e. first lookup on app startup slow, after that fast

• localhost: resolves and lookups all quick. lookup() slightly slower than lookup(...4) (until cache hits)

• heroku: dns.resolve() a lot quicker than dns.lookup(). markets: lookup slower than lookup(v4), portfolio: lookup and lookup(v4) equally slow.

UPDATE - The reason portfolio lookup(v4) was still slow is because lookup is constrained by a fixed threadpool size. Setting that UV_THREADPOOL_SIZE environment variable to a higher value got the test results back to expected. https://nodejs.org/api/dns.html#dns_implementation_considerations

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{
  "context": {
    "geoIp": {
      "country": "FR",
      "region": "",
      "city": "",
      "latitude": 48.86,
      "longitude": 2.35
    },
    "eventTimestamp": "1437050691",

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(function () {


	var totalAttentionTime = 0,
			startAttentionTime,
			endAttentionTime,
			attentionTimeout,
			constantAttentionInterval,
			ATTENTION_INTERVAL = 5000, 
			ATTENTION_EVENTS = ['load', 'click', 'focus', 'scroll', 'mousemove', 'touchstart', 'touchend', 'touchcancel', 'touchleave'],