WordPress admin screen very slow / timing out when editing or adding a new page/custom post

This may not help any, but it can’t hurt to try it… Log into your server admin area, invoke the client interface for your database administration (e.g. phpMyAdmin), delete all the posts where their ‘type’ is marked as a revision, then compact the table.

If you have thousands of pages, you might also have millions of revisions slowing up your access.

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