[horde] CalDAV access slow?

[Guenter Bartsch]

Hi Everyone,

we noticed that thunderbird access to calenders via lightning/caldav
seems a bit slow. e.g. adding an appointment will work, but the added
appointment (in a shared caldav calendar) will appear only after a
30s-90s delay. the effect seems to get worse the more appointment a
calendar contains.

we tried to investigate the problem using cadaver, accessing the
caldav url. turns out access is slow here as well with a single
appointment and will even run into a timeout when that single
appointment is simply set to repeat weekly 40 times:

$ cadaver https://mail.example.com/horde/rpc.php/calendars/m.d/calendar:woCWZdRXnCARUvK1jQNkPg7/
Authentication required for Horde DAV Server on server `mail.example.com':
Username: m.d
Password:
dav:/horde/rpc.php/calendars/m.d/calendar:woCWZdRXnCARUvK1jQNkPg7/> ls
Listing collection
`/horde/rpc.php/calendars/m.d/calendar:woCWZdRXnCARUvK1jQNkPg7/':
connection timed out.
dav:/horde/rpc.php/calendars/m.d/calendar:woCWZdRXnCARUvK1jQNkPg7/>

has anyone else seen this behavior? is this normal (i.e. caldav not
supposed to work when accessed using cadaver)? is this a bug? anything
we could do to fix this?

thanks,

   guenter