I attached 4 screen shots.  

1. draft_sight_memory.jpg - 32GB of memory is used.

( 2 DWG drawings and 1 solidworks Assembly file is operating.)

2. draft_sight_memory(2).jpg - 32GB of memory is used. 

( No DWG drawings but draftsight is operating and 1 solidworks Assembly file is operating.)

3. draft_sight_memory(3).jpg - 4.2GB of memory is used. 

( No DWG drawings and draftsight is shutdown. And 1 solidworks Assembly file is operating.)

4. draft_sight_memory(4).jpg - 4.5GB of memory is used. 

( 1 DWG drawings is Opened on draftsight again. And 1 solidworks Assembly file is operating.)

From 1~4 is my test result. There is strange of using memory when draftsight is operating.

Please, check it and let me know how to correct it.