Ascend has taken a number of different measures to prevent flickering (or flashing) of the original content of page. They include:
1) Loading Synchronously
Ascend by default uses a synchronous loading of the snippet to prevent flickering. Scripts that are loaded synchronously are executed sequentially, one after another, beginning at the start of the <head> tag of the HTML.
It is for this reason, we strongly recommend installing the Ascend snippet as high as possible in the <head> tag of your page. This will minimize the likelihood of any flickering and ensure optimal performance. Like so:
<html lang="en" dir="ltr">
<!-- PLACE YOUR ASCEND SNIPPET HERE, IF POSSIBLE -->
<!-- EVERYTHING ELSE (e.g. Google Analytics, Google Tag Manager, etc. ) -->
2) Optimized Content Delivery System
Ascend has also invested heavily in an optimized content delivery system to make sure the impact on the page is minimized.