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https://issues.apache.org/jira/browse/JAMES-3577?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17338867#comment-17338867
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Benoit Tellier commented on JAMES-3577:
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Sorry I opened this ticket too quickly: the last UID is obtained through an in
memory call to the Slected Mailbox...
> Tiny IMAP performance enhancements
> ----------------------------------
>
> Key: JAMES-3577
> URL: https://issues.apache.org/jira/browse/JAMES-3577
> Project: James Server
> Issue Type: Improvement
> Components: IMAPServer
> Reporter: Benoit Tellier
> Priority: Major
> Labels: perf
>
> Auditing IMAP load with glowroot I was surprised to see thousands of calls to
> the highest Message UID within a mailbox.
> For instance out of 500 MOVE commands the highest UID was checked a thousand
> time...
> A deeper look at the code shows that the latest UID is agressively read
> before a IF loop not requiring it all of the time... When no `*` are
> specified in the range definition we can entirely skip this read... Which
> seems quitte of a common pattern!
> Impacted commands includes:
> - MOVE
> - COPY
> - STORE
> - EXPUNGE
> - FETCH
> By not performing these reads I expect a minor performance increase...
> - Something like7% for MOVE for instance.
> I will report other tiny enhancements I can find as comments of this ticket.
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