Slow mail sending using TLS on port 25

[Janantha Marasinghe]

Hi

Im running postix 2.7 on a ubuntu 10.04 lts server. it is configured to 
use smtp-auth and uses dovecots sasl. My clients connect to the server 
using TLS setting.my issue is that when a client sends a mail it takes 
around 15-20 seconds to make the connection and send the mail. Can I 
tweak the config to make the mail go faster?

Thanks
Jay