Catia STL Data Frozen Problem

Hi Friends,
When i rotate/zoom in/zoom out stl data in catia it moves very slowly. STL data is about 1 GB. (There is no problem for cad data is 1 GB, I have that problem at only STL data) Also in spite of my friends has workstation older than me they work on the same stl data fastly. (rotate/zoom in/zoom out fastly) I attached my workstation tech. spec. Could you help me please? I can not solve this problem.
Thanks in advance
Best regards,