It’s interesting the front end / published site is fast but not the admin.
Have tried turning off all plugins?
Can you setup a 2nd “sandbox” site and import all the content into that? Or try a cheap but fast host like MDD hosting and setup a test site there for $7/month.
If you have a good a developer on staff, they might be able to see if the issue is with database performance using this plugin to profile the database…
http://tierra-innovation.com/wordpress-cms/plugins/wpdb-profiling/
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