FOUC Logo

I've done. it seems the logo doesn't fouc anymore .. any idea how can I keep this situation with Rocket activated?

They provide this guide to testing which setting is causing the issue:

https://docs.wp-rocket.me/article/106-my-site-is-broken

Its generally a problem related to combining and minifying CSS files, but you will need to follow the guide to pin down the problem.

thanks a lot.
I've pointed the error, this is the LAZYLOAD option.

Is there a way to don't allow LAZYLOAD into the LOGO only?

You can try this PHP snippet:

function rocket_lazyload_exclude_class( $attributes ) {
	$attributes[] = 'class="header-image"';

	return $attributes;
}
add_filter( 'rocket_lazyload_excluded_attributes', 'rocket_lazyload_exclude_class' );

That should exclude the site logo.

David,
that works so far, thanks you so much my friend. you're very impressive it's like you already know all solutions ! :o

Haha - glad we could be of help.