-Xmx needs to be only for win(32?) if we change the default. 
put it back to 2048
diff --git a/packages/org.eclipse.epp.package.parallel.feature/epp.product b/packages/org.eclipse.epp.package.parallel.feature/epp.product
index 692e63b..6fe922f 100644
--- a/packages/org.eclipse.epp.package.parallel.feature/epp.product
+++ b/packages/org.eclipse.epp.package.parallel.feature/epp.product
@@ -20,7 +20,7 @@
       <vmArgs>-Dosgi.requiredJavaVersion=1.5
 -Dhelp.lucene.tokenizer=standard
 -Xms512m
--Xmx1024m</vmArgs>
+-Xmx2048m</vmArgs>
       <vmArgsLin>-XX:MaxPermSize=256m</vmArgsLin>
       <vmArgsMac>-XstartOnFirstThread -Dorg.eclipse.swt.internal.carbon.smallFonts
 -XX:MaxPermSize=256m</vmArgsMac>