Memory management in SoapUI

I am working on a rest api project  in soapUI. The project is in the composite mode. everytime I save a change, I can cee the consumed memery in the meory log increases. 

For a given day The memory keeps on increasing throughout the day, and finally resulting OutOfMemory.

I have the below java arguments set 

set JAVA_OPTS=-Xms128m -Xmx2560m -XX:MaxPermSize=1024m -Dsoapui.properties=soapui.properties -Dgroovy.source.encoding=iso-8859-1 "-Dsoapui.home=%SOAPUI_HOME%\" -splash:soapui-pro-splash.png

This is after looking at http://readyapi.smartbear.com/soapui/working/improving_memory_usage.

I  use

1. Java 1.7.0_79. 
2. Windows  7 enterprise.\
3. 12BG RAM
4. Standalone SoapUI Pro version 5.0.0

Is there any other setting that we can set to get over with this?