Position of Infinity JavaScript
The position of our Infinity JavaScript can be key to the way your number loads and flickers.
It is our recommendation that you place the Infinity tracking code in the </head>
tag element as this will allow for the fastest execution, and you are less likely to see a flicker as the phone number changes.
Putting it at the bottom will not affect the code running, but the page will load before the Infinity code executes which may cause the phone number to notably flicker as it changes.
A delay typically is due to the slow loading of your website, the flicker should only be momentary but completely depends on how fast your page renders and runs your JavaScript.