Slow Loading in Roundcube

[Sery]

I saw this message above:
starttls: TLSv1 with cipher DHE-RSA-AES256-SHA (256/256 bits new) no
authentication

i get the same message in my logs. Im surre that is he poblem.
My roundcube is also very very slow and i recognized an ineressting efect on
iphone: he battery gave up after 4 hours and the phone go very hot. I looked
into my kolab logs and saw there a very long list of the same error hat
didnt stop. The phone tried to connect for 4 hours until the battery gave
up. Although the calendar and adressbook were running propperly, the
performance was very terrible. The only error message that repeated was :

starttls: TLSv1 with cipher DHE-RSA-AES256-SHA (256/256 bits new) no
authentication

that sounds like your problem too so i think that might be the problem.
Although the error, the server services running propperly but slow.

i guess the problem is tls/sasl in cyrus

i also installed with aptitude on debian 7.3

has someone new ideas?