The problem: masonry.desandro.com is getting DoS by so many Tumblr themes and poorly coded sites that hot link directly to the script.
Possible solution: redirect requests to cdnjs.com assets
Hotlinked assets
masonry.desandro.com/jquery.masonry.min.js
masonry.desandro.com/jquery.masonry.js
masonry.desandro.com/js/jquery-1.7.1.min.js
masonry.desandro.com/js/jquery.infinitescroll.min.js
CDN assets
//cdnjs.cloudflare.com/ajax/libs/jquery-infinitescroll/2.0b2.110713/jquery.infinitescroll.min.js
//cdnjs.cloudflare.com/ajax/libs/masonry/2.1.08/jquery.masonry.min.js
//cdnjs.cloudflare.com/ajax/libs/jquery/1.7.1/jquery.min.js
Can you check my redirects?
RewriteEngine On
RewriteCond %{HTTP_REFERER} !^http://masonry\.desandro\.com/ [NC]
RewriteCond %{HTTP_REFERER} !^$
RewriteRule masonry.desandro.com/jquery.masonry.min.js http://cdnjs.cloudflare.com/ajax/libs/masonry/2.1.08/jquery.masonry.min.js [L]
RewriteRule masonry.desandro.com/jquery.masonry.js http://cdnjs.cloudflare.com/ajax/libs/masonry/2.1.08/jquery.masonry.min.js [L]
RewriteRule masonry.desandro.com/js/jquery-1.7.1.min.js http://cdnjs.cloudflare.com/ajax/libs/jquery/1.7.1/jquery.min.js [L]
RewriteRule masonry.desandro.com/js/jquery.infinitescroll.min.js http://cdnjs.cloudflare.com/ajax/libs/jquery-infinitescroll/2.0b2.110713/jquery.infinitescroll.min.js [L]