I just recently came across a great article titled How tracking scripts affect page loads… can Google Analytics kill my web app?:
This post explains script blocking, and then shows how to safely setup a tracking script or any external script, such as Google Analytics or Quantcast, to not block page loads or other javascript handlers on your site.
It’s a great read and provides a clear explanation on how third party components (everything from advertisements to analytics to content widgets) can slow your site down. JavaScript includes have been commonly used in websites for coming on a decade, but there are still many people who don’t understand the destruction a rogue script can cause to user experience.
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