Roundcube very slow when configured as NAT

[fhiarey]

Hi guys,

Please help me with my problem regarding roundcube behind firewall. I configured it as NAT and allowed necessary ports in the firewall.
When accessing from the internal network everything is ok but when accessing and creating emails from public IP or from the internet it is taking 10 seconds to load.

Thanks a million.

Fhia

[SKaero]

Whats your internet connection speed up and down?

[fhiarey]

Hi it is 5MB up and down.
It is just when we configure the server behind NAT that is it is taking long time to load.
Thank you,

[SKaero]

Is Roundcube accessing the mail server locally or though the NAT?