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#index-lazy-loading

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Lazy index loading in Dovecot for large mailboxes

Learn how Dovecot’s lazy index loading uses mmap to speed up IMAP startup, how to tune cache size, and when to rebuild a stale index.

index-lazy-loading imap

dovecotTasadduq Burneyowner29.5K rep · 22 Nov 2025, 05:02 UTC