Let’s make yours great. Just Say "YES!". You'll receive email notifications for new posts at. The async attribute means that a script is completely independent: The browser doesn’t block on async scripts (like defer). If you can't install the anti-flicker snippet inline you should skip it altogether. Or if you’re collecting some page-specific heatmaps? The most effective way to mitigate page flicker when loading Optimize is to temporarily hide the page while the Optimize container loads. Google Tag Manager is great for making it easy to manage multiple tags with the various rules and ability to switch tags on and off, and does improve user experience by ensuring that third parties do not impact the loading of any content that comes before the onload event. It also makes the script non-blocking. Your notifications are currently off and you won't receive subscription updates. This article is intended for customers that have observed page flicker on their Optimize experience pages. Facebook and Google do implement async loading, but the onload event will still be delayed when those tags hang. From experience, GTM can severely impact the page load. You probably wouldn't even notice it. If the async attribute is present, then the script will be fetched in parallel to parsing and evaluated as soon as it is available (potentially before parsing completes). 4619 N. Ravenswood Ave. Suite 104 The page-hiding snippet was previously known as the anti-flicker snippet. When you submit a report, we'll investigate it and take the appropriate action. Here’s how a page loads a script without defer or async, put at the end of the body tag, just before it closes: However, that is not necessarily true. Which means better concurrency. Here’s where to find the “Pause” functionality: Users will start reading/interacting with a page before it’s fully loaded, so having a quick initial page load is ideal. Find a solution that fits. Here is an example of onload event hanging on Chrome 41. Only then Google Tag Manager can catch it and use it as a triggering condition. If you're setting up the Web Widget with GTM for the first time, we recommend using the new snippet and following the procedure outlined below. You will lose what you have written so far. In some instances, changes are made to elements that are already visible to the end user. Before Google Tag Manager, this means you would edit the header file, insert your code, and voila — the snippet is above the on every page of your website. Alternatively, defer it to load after the window has loaded (but you'll risk losing a lot of analytics and Ads data). Every tag on your site adds more server requests, and more server requests mean your page takes longer to load. Easily access and use the Tag Manager API through Google Apps Script. The