Hello Titush,
Thank you for your kind words and sorry to see you are having such memory issues.
To start off with this issue is specific to your setup, i.e. it is not a known common issue so ideally we should troubleshoot the issue in your scenario. WE need more information on your setup, for example how many members you have, what plugins you have installed, which theme you are using and so on.
I do not recommend posting such information on such forums hence can you please get in touch with us via email on support@wpwhitesecurity.com?
Looking forward to hearing from you.