Too many pages causes WordPress admin to be unusable

Unfortunately the details you’ve provided are a bit limited. For example, what sort of hosting are you on and what sort traffic are you dealing with here?

If you have a shared hosting account then you should know that shared hosts provide you with limited cpu and memory resources as it’s shared across multiple hosting accounts.

In my experience when wp starts to act up either on the frontend or the admin – it’s due to a query returning large results, be it posts, pages, or images – it’s definitely resource related, either not enough memory allocated to php or not enough cpu power to complete a process.

Sometimes an unoptimized database could be the cause as well – you could try http://wordpress.org/extend/plugins/wp-dbmanager/

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