2nd segment is too slow

Dear All, 

We are using Sonicwall NSA2600, Presently we having two networks (192.168.1.1 to 192.168.2.254), In this present setup we are facing slow connectivity issue in the 2nd segment (192.168.2.) while accessing the local server or local CRM (Intranet).

Internet is working fine. Kindly advice me to resolve the same ASAP.

Thanks in advance.