Custom Components Slow Load


I’ve tried 3 different plugins: “Battery Entity Card”, “button-card” and “card-mod”.
What happen is if I apply any custom component, when I refresh page, it loads the page without the components and then after millisecons, loads the component, and it shows like a “flick”. Without applying custom components, it don’t do that. Please check the gifs bellow:

Now, this is how an enitty works without custom cards, see the difference:

Also my Header make a flicks, and I have the original one… What is making this happen? or is that normal? Can anyone try and check if it happens when reloading page (F5). It also happen on mobile and others browsers.