diff --git a/prism/src/bin/prism.cygwin b/prism/src/bin/prism.cygwin
index 6a4b54eb..c4b8c82f 100644
--- a/prism/src/bin/prism.cygwin
+++ b/prism/src/bin/prism.cygwin
@@ -19,7 +19,7 @@ if [ "$PRISM_JAVAMAXMEM" != "" ]; then
 	PRISM_JAVAMAXMEM="-Xmx$PRISM_JAVAMAXMEM"
 else
 	# default
-	PRISM_JAVAMAXMEM="-Xmx512m"
+	PRISM_JAVAMAXMEM="-Xmx2g"
 fi
 PRISM_JAVASTACKSIZE="-Xss4M"
 
diff --git a/prism/src/bin/prism.darwin32 b/prism/src/bin/prism.darwin32
index 4a75a18e..faabd4e9 100755
--- a/prism/src/bin/prism.darwin32
+++ b/prism/src/bin/prism.darwin32
@@ -27,7 +27,7 @@ if [ "$PRISM_JAVAMAXMEM" != "" ]; then
 	PRISM_JAVAMAXMEM="-Xmx$PRISM_JAVAMAXMEM"
 else
 	# default
-	PRISM_JAVAMAXMEM="-Xmx512m"
+	PRISM_JAVAMAXMEM="-Xmx2g"
 fi
 PRISM_JAVASTACKSIZE="-Xss4M"
 
diff --git a/prism/src/bin/prism.darwin64 b/prism/src/bin/prism.darwin64
index f1c173c4..ecddf04e 100755
--- a/prism/src/bin/prism.darwin64
+++ b/prism/src/bin/prism.darwin64
@@ -27,7 +27,7 @@ if [ "$PRISM_JAVAMAXMEM" != "" ]; then
 	PRISM_JAVAMAXMEM="-Xmx$PRISM_JAVAMAXMEM"
 else
 	# default
-	PRISM_JAVAMAXMEM="-Xmx512m"
+	PRISM_JAVAMAXMEM="-Xmx2g"
 fi
 PRISM_JAVASTACKSIZE="-Xss4M"
 
diff --git a/prism/src/bin/prism.linux b/prism/src/bin/prism.linux
index 15887ec2..bbff65e1 100755
--- a/prism/src/bin/prism.linux
+++ b/prism/src/bin/prism.linux
@@ -27,7 +27,7 @@ if [ "$PRISM_JAVAMAXMEM" != "" ]; then
 	PRISM_JAVAMAXMEM="-Xmx$PRISM_JAVAMAXMEM"
 else
 	# default
-	PRISM_JAVAMAXMEM="-Xmx512m"
+	PRISM_JAVAMAXMEM="-Xmx2g"
 fi
 PRISM_JAVASTACKSIZE="-Xss4M"