Pages admin unresponsive, posts no problem, tried everything

Hi all,

I’m getting desperate. I can edit posts without a problem, but when editing pages they are all unresponsive or extremely slow! Tried emptying the cache, tried deactivating plugins, and deleting unused themes. I tried all the solutions I could find on various forums. Taking too long now. Help!

The page I need help with: [log in to see the link]