To experience the best MBR CRM and WP performance, you need to disable built-in WP Cron system.
To disable WP-Cron, add the following to your wp-config.php file, just before the line that says “That’s all, stop editing! Happy blogging.”
Note: This disables WP Cron from running on every page load.
If you are not able to modify your wp-config.php you can also disable WP Cron by going to the Misc settings. Although this may not work on some hosts, and you should verify with your hosting company if you are experiencing issues.
Once you have disabled the internal WP Cron you must set up an external Cron Job.