[Dovecot] migration 1.2.5 -> 2.0.5 load increased dramatically

During norml operation this morning we're seeing a significantly increased load on the IMAP server (factor 5, from 5 to 25).

Does dovecot need to rebuild index files or perform other IO intensive operations after the upgrade?

We're using Maildir

Our monitoring shows increased "system" time. We're runnign fewer processes, the IO rate ist identical to yesterday, memory usage is identical.

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