Reply To: my 15000+ members site dies when BP is on
We had problems upgrading a large site – see: https://buddypress.org/support/topic/wsod-in-wp-admin-activating-site-tracking-upgrade-from-1-2-9-1-5/
I assume some BP script in the backend was timing out.
We solved by:
1. exporting our users / user_meta table. Leaving just the admin user
2. upgrading BP
3. Reimporting the users
This worked fine. The problem only occurred if all the users were present during the actual upgrade process.