- An image named contact_social.png that creates a 404 error
The only place where the contact_social.png image is used is in style.css and there the link is correct for sure. If you would go to yoursite/wp-content/themes/writer/images/icons/contact-social.png you would see that the image is there. Maybe you made some changes and added the image somewhere else as the generated link which is visible in firebug is wrong.
- A google map js script that are called (during 1 full second) => I won't use google map, how could I suppress it and make the web page load faster ?
You can remove the script from theme_add.php file (library\tfuse_mods\thememodules\includes) this is the code:
wp_register_script( 'gmap', $template_directory.'/js/jquery.gmap.min.js' );
wp_enqueue_script( 'gmap' );