Nope, this is normal with AdminPraise Lite. It all has to do with server speed, number and size of CSS & Javascript files and your Internet connection.
Akeeba Backup Core and Pro have a big red warning stating that jQuery is not loaded. Once the jQuery and Akeeba Backup's interface Javascript files are loaded, a tiny piece of jQuery runs and hides this notification. When you have a complex template with a lot of CSS and Javascript, it takes a while to finalize loading jQuery and, as a result, it takes a while to hide the warning, causing the flash.
There is nothing we can do about it except you using Firefox which caches the files and eliminates the problem after the first page load. Yeap, I specifically mentioned Firefox, as the other browsers will bust their cache whenever your Joomla! back-end performs a background redirection, which is after each administrative action you make, causing the JS and CSS files to be reloaded from your server on practically every page load.
Nicholas K. Dionysopoulos
Lead Developer and Director
🇬🇷Greek: native 🇬🇧English: excellent 🇫🇷French: basic • 🕐 My time zone is Europe / Athens
Please keep in mind my timezone and cultural differences when reading my replies. Thank you!