[Cloud] Please help with optimizing a SQL query

Hello,

could someone please help me with optimizing the following query?

USE commonswiki_p;

SELECT first_upload, uploads, username FROM ( SELECT MIN(log_timestamp) AS first_upload, MIN(log_id) AS first_upload_id, COUNT(log_timestamp) AS uploads, log_user_text AS username FROM logging_compat LEFT JOIN user ON user_id = log_user JOIN page ON log_page = page_id WHERE log_type = "upload" AND (log_action = "upload" OR log_action = "overwrite") AND user_registration > "20190101000000" GROUP BY log_user ) AS first_uploads JOIN change_tag ON ct_log_id = first_upload_id WHERE ct_tag_id=21;

It takes over 30 minutes :/. I want to have a list of users whose first contrib to Wikimedia Commons is tagged with tag number 21.

Thanks!

Martin