Hi there

Recently we migrated 4000+ lists from Mailman 2 to 3 and noticed a drastic slowdown of response time (30+ secs) when listing lists or domains while logged in as any user.

Affected are the following paths:

• https://mm3.com/mailman3/lists/
• https://mm3.com/mailman3/domains/

When visiting one of the affected pages, a lot of API requests are visible in mailman.log:

[25/Jul/2022:11:02:02 +0200] "GET /3.1/domains/domain1.com HTTP/1.1" 200 202 "-" "GNU Mailman REST client v3.3.3" [25/Jul/2022:11:02:02 +0200] "GET /3.1/domains/domain2.com HTTP/1.1" 200 188 "-" "GNU Mailman REST client v3.3.3" [25/Jul/2022:11:02:02 +0200] "GET /3.1/domains/domain3.com HTTP/1.1" 200 200 "-" "GNU Mailman REST client v3.3.3" [25/Jul/2022:11:02:02 +0200] "GET /3.1/domains/domain4.com HTTP/1.1" 200 218 "-" "GNU Mailman REST client v3.3.3"

I'm suspecting an n+1 issue where a request is made for every list entry and even if the API response times are quick (15-20ms), this time accumulates.

Regards, Patrik

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