Slow user Authentication in ECC 6.0 EHP7

Hi Experts,

Recently users started complaining about slow user authentication. We are facing this issue only in ECC production landscape where it's taking ~15 seconds when in company and ~40 seconds when on VPN or working from remote office.

Whereas ECC project landscape systems are just fine, no delay at all. I looked into STAD to do the comparison & found that there are 490 round trips + high GUI time on ECC production landscape systems Vs 88 round trips + low GUI time on ECC project landscape systems.

I understand that round trips are between GUI and APP server to transfer data. And the reason why there are 490 round trips on production landscape systems because 16 MB data (Terminal out-message) is transferred Vs 2MB data is transferred while authentication takes place on  ECC project landscape systems.

I need your expert advice to know why that much data is transferred  while authentication takes place on  ECC production landscape systems?

Following screenshots for your reference:

Screenshot ECC production landscap:

Screenshot ECC project landscap:

Thanks,

Hardeep