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There are two values that you have to increase in your /etc/php.ini file. Keep in mind, you will have to restart apache:
max_input_vars = 7500 post_max_size = 1G
Then, you should be able to have more items. Note though, if you are using a more recent version of apache that leverages php-fpm, you web server will likely time out performing expensive operations. Not happy about that of course, but not much that can be done.
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