5f896ae8f7
This optimisation avoids large scans joining the topics table with the topic_users table. Previously when a user carried a lot of read state we would have to join the entire read state with the topics table. This operation would slow down home page and every topic page. The more read state you accumulated the larger the impact. The optimisation helps people who clean up unread, however if you carry unread from years ago it will only have minimal impact. |
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