- PHP version : above 5.6
- max_execution_time : 600 or above
- memory_limit : 128M or above
- post_max_size : 32M or above
- upload_max_filesize : 32M or above
- max_input_vars : 5000 or above
How to Check Server Information : Use this plugin to test it https://wordpress.org/plugins/wp-server-stats/ or https://codex.wordpress.org/Finding_Server_Info or https://wordpress.org/plugins/php-settings/
How to Edit Server Information : https://stackoverflow.com/questions/7739870/increase-max-execution-time-for-php or use plugin https://wordpress.org/plugins/php-settings/ or https://codex.wordpress.org/Editing_wp-config.php#Increasing_memory_allocated_to_PHP
Note : If you don't have access of your sever's configuration files due to shared server, You need to contact your hosting provider for this.