We are about to upgrade to Mailman core 3.3.9 and Postorius 1.3.10. We notice that for setup with large number of members, the performance is much slower when listing members on web (Postorius). Further troubleshooting show that there are quite a number of API calls which do not appear in Mailman core 3.3.5 and Postorius 1.3.6 when we list members.

[17/Apr/2024:14:12:22 +0800] "GET /3.1/members/33a6266d0a04472c8d5d6c78869a964c/preferences HTTP/1.1" 200 156 "-" "GNU Mailman REST client v3.3.5" [17/Apr/2024:14:12:22 +0800] "GET /3.1/members/7a18b7cb90a34ac98881a3f01b5488d1/preferences HTTP/1.1" 200 156 "-" "GNU Mailman REST client v3.3.5" [17/Apr/2024:14:12:22 +0800] "GET /3.1/members/61c6c3e2aaf443babd3bd191519b0424/preferences HTTP/1.1" 200 156 "-" "GNU Mailman REST client v3.3.5" [17/Apr/2024:14:12:22 +0800] "GET /3.1/members/8dd681165b8c436fac6793cae1ed2c27/preferences HTTP/1.1" 200 156 "-" "GNU Mailman REST client v3.3.5"

Further tests showing that each database query using "_member_id" in table member can take as much as 0.3 to 0.5 seconds for some large installations. The default 25 members per page mean that it will take at least 7.5 to 12.5 seconds. Changing to 200 members per page will take even longer time. We wonder whether "_member_id" should be indexed just like most other id in the database mailman_core in order to solve the issue. Or are there any other workarounds?

+----------------------+--------------+------+-----+---------+----------------+ | Field | Type | Null | Key | Default | Extra | +----------------------+--------------+------+-----+---------+----------------+ | id | int(11) | NO | PRI | NULL | auto_increment | | _member_id | char(32) | YES | | NULL | | | role | int(11) | YES | MUL | NULL | | | list_id | varchar(255) | YES | MUL | NULL | | | moderation_action | int(11) | YES | | NULL | | | address_id | int(11) | YES | MUL | NULL | | | preferences_id | int(11) | YES | MUL | NULL | | | user_id | int(11) | YES | MUL | NULL | | | bounce_score | int(11) | YES | | NULL | | | last_bounce_received | datetime | YES | | NULL | | | last_warning_sent | datetime | YES | | NULL | | | total_warnings_sent | int(11) | YES | | NULL | | +----------------------+--------------+------+-----+---------+----------------+