How can i deactivate Lazy Load on some pages?

<?php

add_filter( 'lazyload_is_enabled', 'let_masonry_do_its_stuff' );

function let_masonry_do_its_stuff( $enabled ) {

	if ( is_page($id1, $id2, etc) )
		$enabled = false;

	return $enabled;
}

Use comma to do multiple page. There is a plugin that shows ids in pages/forums/posts/gallery etc, install that and use it to find ids for your page that you want to disable.