Publishing and updating pages or posts takes a very long time (approx. 45 seconds with 'loading wheel' once clicked on the Publish/Update button).
The same problem occurs when editing Menus.
It used to be much faster and suddenly became much slower.
The rest of the website is fast.
All the Update Services are removed from the Settings > Writing.
Do you have any idea what could cause that?
WP: 3.5.1 (latest)
Plugins: WPML, W3 Total Cache, Source Redirect Site, Redirection, Page Links To, All in One SEO Pack, Yoast Breadcrumbs