diff --git a/build.xml b/build.xml
index 2749e235a..63e7a83d4 100644
--- a/build.xml
+++ b/build.xml
@@ -529,7 +529,7 @@
                     name="FreeCol"
                     mainclass="${freecol.main.class}"
                     version="${freecol.version}"
-                    vmoptions="-Xmx1G -Dapple.awt.fakefullscreen=true"
+                    vmoptions="-Xmx2G -Dapple.awt.fakefullscreen=true"
                     jvmversion="1.11+"
                     arguments="--windowed --freecol-data FreeCol.app/Contents/Resources/"
                     stubfile="${freecol.build.dir}/skeletons/universalJavaApplicationStub"
@@ -962,7 +962,7 @@
     <!-- This is a shortcut for NetBeans, and possibly other IDEs. -->
     <target name="run" depends="package" description="Runs the game">
         <java jar="FreeCol.jar" fork="true">
-            <jvmarg value="-Xmx1G" />
+            <jvmarg value="-Xmx2G" />
         </java>
     </target>
 
diff --git a/build/startup.jsmooth b/build/startup.jsmooth
index 2abfeb8c3..57d5599fe 100644
--- a/build/startup.jsmooth
+++ b/build/startup.jsmooth
@@ -15,13 +15,13 @@
     <embeddedJar>false</embeddedJar>
     <executableName>freecol.exe</executableName>
     <iconLocation>../packaging/icons/freecol.ico</iconLocation>
-    <initialMemoryHeap>134217728</initialMemoryHeap>
+    <initialMemoryHeap>1073741824</initialMemoryHeap>
     <javaProperties>
         <name>sun.java2d.d3d</name>
         <value>false</value>
     </javaProperties>
     <mainClassName>net.sf.freecol.FreeCol</mainClassName>
-    <maximumMemoryHeap>536870912</maximumMemoryHeap>
+    <maximumMemoryHeap>2147483647</maximumMemoryHeap>
     <maximumVersion></maximumVersion>
     <minimumVersion>1.8</minimumVersion>
     <skeletonName>Windowed Wrapper</skeletonName>
diff --git a/packaging/common/README b/packaging/common/README
index b0dd1a7ae..72f83af40 100644
--- a/packaging/common/README
+++ b/packaging/common/README
@@ -51,10 +51,10 @@ the directory where you executed the 'ant' command (in case you
 downloaded the source package).
 Make sure the file named 'FreeCol.jar' is in your current directory.
 
-Execute the command 'java -Xmx1G -jar FreeCol.jar'
+Execute the command 'java -Xmx2G -jar FreeCol.jar'
 
 Windows users may need to execute
-'java -Xmx1G -cp . -jar FreeCol.jar'
+'java -Xmx2G -cp . -jar FreeCol.jar'
 
 In case the command could not be found, check your Java installation
 and make sure that the java (*nix) or java.exe (Windows) file is in
diff --git a/packaging/common/freecol.cmd b/packaging/common/freecol.cmd
index 3a37ba8d1..614c4b977 100644
--- a/packaging/common/freecol.cmd
+++ b/packaging/common/freecol.cmd
@@ -1 +1 @@
-java -Xmx1G -Dsun.java2d.d3d=false -jar FreeCol.jar %*
+java -Xmx2G -Dsun.java2d.d3d=false -jar FreeCol.jar %*
diff --git a/packaging/common/freecol.sh b/packaging/common/freecol.sh
index 9606991e7..cd6cc91fe 100755
--- a/packaging/common/freecol.sh
+++ b/packaging/common/freecol.sh
@@ -79,7 +79,7 @@ fi
 
 # Clean up the data argument and run.
 if test "x${FCDAT}" = "xDONTSET!" ; then
-    exec java -Xmx1G -cp "${FCJAR}" net.sf.freecol.FreeCol ${1+"$@"}
+    exec java -Xmx2G -cp "${FCJAR}" net.sf.freecol.FreeCol ${1+"$@"}
 else
-    exec java -Xmx1G -cp "${FCJAR}" net.sf.freecol.FreeCol --freecol-data "${FCDAT}" ${1+"$@"}
+    exec java -Xmx2G -cp "${FCJAR}" net.sf.freecol.FreeCol --freecol-data "${FCDAT}" ${1+"$@"}
 fi