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https://issues.apache.org/jira/browse/JAMES-3466?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17245761#comment-17245761
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Benoit Tellier commented on JAMES-3466:
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https://github.com/linagora/james-project/pull/4113 contributes this.
> Provision 'system' mailboxes only when listing mailboxes
> --------------------------------------------------------
>
> Key: JAMES-3466
> URL: https://issues.apache.org/jira/browse/JAMES-3466
> Project: James Server
> Issue Type: Improvement
> Components: JMAP
> Affects Versions: master
> Reporter: Benoit Tellier
> Assignee: Antoine Duprat
> Priority: Major
>
> ## Why
> Today we list 5 mailboxes, doing 5 primary key reads on consistency SERIAL
> every time we perform a JMAP request.
> This has a major impact on the actual JMAP performance, and is most of the
> time unecessary.
> For instance a class flow is:
> - Mailbox/get
> - Email/query
> - Email/get to list preview
> - Email/get on each open message (say x10)
> - Email/set upon user actions (say x5)
> We end up checking mailbox provisionning 18 time.
> We need to reduce the impact of this provisionning while keeping the benefits
> of it.
> ## How
> Provision mailboxes only when calling Mailbox/get.
> ## Expected outcome
> Performance enhancement.
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