Am 06.06.2016 um 12:30 schrieb Thomas Keil:

Might it be an issue with the format of contacts? I used a vcard import
from my old calender....

That is possibly the reason for the not working sync with android at
least. I also imported old contacts (some even from an LDAP directory),
had several clients adding contacts, and ended up with some contacts
severely broken. Some contacts I could not delete in the Contacts app of
owncloud 9.0, for some the name was not shown, and some could not be
synchronized with cardbook (thunderbird addon)... the reason was a
broken UID in the vcards, there where special symbols which seem to
break things. I basically exported all contacts (synced them to cardbook
and manually added unsyncable contacts), fixed everything, and
reimported a clean vcard file.
Maybe a similar problem is responsible for your performance problem. I
would probably do a full backup and try what happens with a new
addressbook (deleting the old one) and only a few (manually added)
contacts, to see where the problem really is (the setup or the contacts).

So, follow up: Some of the vCard items really looked screwed (multiple header lines, empty data lines, etc), so I deleted my contacts directly on the database and synced an emtpy addressbook. I then loaded the contacts on the phone into the owncloud addressbook and synced to the server. There seems to be still a problem/limit - I had to sync 4 time to transfer 317 contacts, each run PUT exact 80 items but finally all contact are on OC server now and the webui loads within ~5 seconds.

Its not perfect but looks usable now.

Oliver

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