I assume that the server database is in use and all view indeces are built. These affect the nsf size on the server.
You can activate DAOS, Design and Document compression, this will reduce the size, but only after a copy style compact.
If the server is on 9.0.1FP8 you can enable NIFNSF support and separate t1he view index from the database.
https://www.ibm.com/support/knowledgecenter/SSKTMJ_9.0.1/admin/admn_moving_views_out_of_databases.html