I have this issue as well, only on /wp-admin/index.php.
My apache error log says:
[07-Oct-2024 13:14:51 UTC] 2024-10-07 13:14:51 wpMandrill::getCurrentStats (Empty Transient. Getting persistent copy)
[07-Oct-2024 13:14:51 UTC] 2024-10-07 13:14:51 wpMandrill::getCurrentStats (Empty persistent copy. Getting data from Mandrill)
[07-Oct-2024 13:14:57 UTC] 2024-10-07 13:14:57 wpMandrill::getCurrentStats (Empty Transient. Getting persistent copy)
[07-Oct-2024 13:14:57 UTC] 2024-10-07 13:14:57 wpMandrill::getCurrentStats (Empty persistent copy. Getting data from Mandrill)
Eventually it times out. Advice, anyone?