[Dovecot] compressed mboxes very slow

[Kamil Jońca]

I have some archive mails in gzipped mboxes. I could use them with
dovecot 1.x without problems.
But recently I have installed dovecot 2.0.12, and they are slow. very
slow.

Creating index files takes about 10 minutes for ~20M file with 560
messages for bzipped mbox, for gzipped is little better but still
unusable :(

Stracing dovecot process shows that every ~ 20 messages it rereads
complete mbox file.

Am I doing something wrong?
KJ

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