ClickGUARD tracking code has no impact on page load times based on the following:

It’s loaded asynchronously, therefore not impeding loading of the page itself
It’s not modifying the visual representation of the page except in the case where a popup warning is shown to the offender, which is done after the page loads

How is the code loaded asynchronously?

By making this script async ClickGUARD literally tells the browser not to depend anything on loading the script result. Per Google’s speed optimization recommendations, adding the async keyword to the script tag tells the browser not to block DOM construction while it waits for the script to become available, which can significantly improve performance.

The modern method being adopted by the industry is to load tags asynchronously. In this method JavaScript code is processed in parallel to the rest of the page content. This means that even if a vendor tag is slow to respond or to load, it will not slow down the rest of the page.