After having migrated my website, Savia theme option is not working anymore. It freezes all the time.

What freezes? You do not have the Theme Options migrated?
When I migrate a website I always use the Duplicator plugin, I highly recommend it. Not only it moves all WP core files, media uploaded, it also changes the relative/absolute paths in the posts as well as all DB entries, it basically creates mirror images of a website!
If you use it you will preserve everything the way it was on your testing server.

You can add this to your functions.php file, it should fix that:

// Fix Chrome Dashboard Menu problem
function boc_chromefix_inline_css()
{ 
  wp_add_inline_style( 'wp-admin', '#adminmenu { transform: translateZ(0); }' );
}

add_action('admin_enqueue_scripts', 'boc_chromefix_inline_css');