[Bug 202917] New: Retrieving IMAP folders updates takes several minutes

[mahen]

https://bugs.kde.org/show_bug.cgi?id=202917

           Summary: Retrieving IMAP folders updates takes several minutes
           Product: kmail
           Version: 1.12.0
          Platform: Ubuntu Packages
        OS/Version: Linux
            Status: UNCONFIRMED
          Severity: normal
          Priority: NOR
         Component: general
        AssignedTo: kdepim-bugs at kde.org
        ReportedBy: listes at mahen.fr


Version:           1.12.0 (using KDE 4.3.0)
OS:                Linux
Installed from:    Ubuntu Packages

Using (several) IMAP accounts with several folders and subfolders, checking for
new emails takes forever (several minutes, versus a few seconds in Evolution or
Thunderbird).

Three issues :

1) it checks each folder each time (instead of checking all folders the first
time, then checking only the "incoming" folder)
2) more importantly : when checking the status at the bottom of the screen, the
same percentage and same folder name remains for a very long time (sometimes,
several minutes for the same IMAP folder)
3) I can get (but not necessarily) an warning indicating that I was
disconnected from the IMAP server. Not each time but that happens eventually.

Anyway, when being patient enough (within 5 or 10 minutes), I always manage to
get the new emails. When using the System monitor, I can clearly see that kmail
remains entire minutes without receiving data. Sometimes, it looks like
"sawteeth".

Note : I have about 15 IMAP folders but that is not, IMO, the issue, as kmail
seems to be checking the very same folder for several minutes before getting to
the next ones.

This issue had happened with all KDE 4.x KMail versions. Even maybe with KDE
3.x. Occured with all distros (Arch, Kubuntu, etc.). It doesn't occur with any
other mailer (evolution, thunderbird, apple mail...)

It occurs with both connected and disconnected IMAP. With OVH and FREE (French
provider) servers.

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