Apache mod_rewrite.c code for WordPress to load images from a production server if not found locally. Replace https://www.example.com with your production URL.

.htaccess

<IfModule mod_rewrite.c>
  RewriteEngine On
  RewriteCond %{REQUEST_FILENAME} !-f [NC]
  RewriteRule ^(.*\.(js|css|png|jpe?g|gif|ico)) https://www.example.com/$1 [QSA,L,C]
</IfModule>

# BEGIN WordPress
<IfModule mod_rewrite.c>
  RewriteEngine On
  RewriteBase /
  RewriteRule ^index\.php$ - [L]
  RewriteCond %{REQUEST_FILENAME} !-f
  RewriteCond %{REQUEST_FILENAME} !-d
  RewriteRule . /index.php [L]
</IfModule>
# END WordPress