http://quicksoftwaretesting.com/soapui-jvm-heap-size-xmx-error/
-Xms128m
-Xmx1000m
-Dsoapui.properties=soapui.properties
-Dsoapui.home=C:Program Files (x86)SmartBearsoapUI-4.5.2/bin
-Dsoapui.ext.libraries=C:Program Files (x86)SmartBearsoapUI-4.5.2/bin/ext
-Dsoapui.ext.listeners=C:Program Files (x86)SmartBearsoapUI-4.5.2/bin/listeners
-Dsoapui.ext.actions=C:Program Files (x86)SmartBearsoapUI-4.5.2/bin/actions
-Dwsi.dir=C:Program Files (x86)SmartBearsoapUI-4.5.2/wsi-test-tools
-Djava.library.path=C:Program Files (x86)SmartBearsoapUI-4.5.2/bin
-Djava.util.Arrays.useLegacyMergeSort=true
-Djxbrowser.xulrunner.dir=C:Program Files (x86)SmartBearsoapUI-4.5.2.JxBrowser
Change to -Xmx500m