[Users] claws performance, >100.000 emails

behn chr.graf at gmx.de
Sun Apr 27 01:36:21 CEST 2014

Hi Colin, Hi Nicolas, Hi Erich,

kind thanks for this quick and useful help. Your answers are encouraging 
me to invest the time for migration.
1 mbox per folder during migration sounds impractical to me. I hope by 
setting up a local imap-server (dovecot) I  will be able to copy 
complete directories. The idea I have is the following:

a) use thunderbird, copy pop3-fetched folders to imap-account on local 
b) use claws, sync to same imap-account and copy the imap-folder, 
including of all the subdirs, into claws

any comments on this idea very much welcome.

@Nicolas - yes, header-search will be used:)
@Erich - the root-cause for beeig slow is still an issue - you are right 
by asking for it. Beside beeing slow, the directory-structure within TB 
gets corrupt. From time-to-time complete folders disappear.
By tries to get it fixed failed so far (like deleting msf, comapcting, 
creating new-folders and copy emails - and then delete old folders,...), 
so I need a cleanup anyway.

good to know that folder shall stay <10k emails for best performance.



On 04/27/2014 01:09 AM, Erich Dollansky wrote:
> Hi,
> On Sat, 26 Apr 2014 19:34:40 +0200
> "christian (private)" <chr.graf at gmx.de> wrote:
>> I am new to claws and my first impression about claws is very
>> positive. So I am tempted to move from thunderbird to claws.
> I did this a long time ago.
>> My main concern is performance honestly. I have roughly 130.000
>> emails stored in my thunderbird (pop3), including attachments. The
>> thundebird profile is about 16G in size.
> It is all a matter of organisation. Claws-Mail becomes slow the more
> mails are in one directory/folder. You will feel the difference when
> there are more than 10 000 mails in a folder. I did not notice any
> problems having the mails organised in many folders. I have more than
> 600 000 messages currently stored and did not notice any problems.
>> So I am wondering if claws can handle such large emails nicely? TB
>> slowed down heavily last months, so I am looking for an alternative.
> I do not wonder.
>> As an example, just sliding through the offline folders (not clicking
>> into any of them) results in multiple-seconds of screen-freeze.
> This sounds extremely bad. Are you sure that it was caused by
> Thunderbird?
>> Claws/TB will run on a ubuntu-desktop, with 8GB ram and SSD as
> I use FreeBSD only and cannot tell if Ubuntu will make a difference.
>> storage. The number of emails to handle will most likely grow further.
>> related to this would be the question how fast the search-engine will
>> be. The reason for storing the emails is to search them. So its
>> crucial that claws is somewhat fast in searching such large
>> structures.
> Searching was never a problem for me. Of course, it is limited in speed
> with such an amount of data by the hardware in use.
> Erich

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