not post issue ....
What i try to do is, Mass delete (1000 post) by using the plugin, it work perfectly before
If so, try deleting 500 at a time.
Personally, if I was dealing with this many records, I'd delete them directly from the database.
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Man, 10 minutes to execute a script is the main issue.
To directly delete stuff you can log into your cpanel area and go to the phpMyAdmin icon and go and explore that area to work out where your database is being clogged up.