diff --git a/Mage.Client/release/startClient.bat b/Mage.Client/release/startClient.bat
index 230bd9a40e4..43a977108f6 100644
--- a/Mage.Client/release/startClient.bat
+++ b/Mage.Client/release/startClient.bat
@@ -4,4 +4,4 @@ set JAVA_HOME="C:\Program Files\Java\jre6"
 set CLASSPATH=%JAVA_HOME%/bin;%CLASSPATH%
 set PATH=%JAVA_HOME%/bin;%PATH%
 :NOJAVADIR
-start javaw -jar .\lib\mage-client-${project.version}.jar -Xms256M -Xmx1024M -XX:MaxPermSize=256M
\ No newline at end of file
+start javaw -jar .\lib\mage-client-${project.version}.jar -Xms256M -Xmx1024M -XX:MaxPermSize=256M -XX:+UseConcMarkSweepGC -XX:+CMSClassUnloadingEnabled
\ No newline at end of file
diff --git a/Mage.Client/release/startClient.command b/Mage.Client/release/startClient.command
index 0ed90abefa5..5c1f84ada5b 100644
--- a/Mage.Client/release/startClient.command
+++ b/Mage.Client/release/startClient.command
@@ -2,4 +2,4 @@
 
 cd "`dirname "$0"`"
 
-java -jar ./lib/mage-client-${project.version}.jar -Xms256M -Xmx1024M -XX:MaxPermSize=256M &
\ No newline at end of file
+java -jar ./lib/mage-client-${project.version}.jar -Xms256M -Xmx1024M -XX:MaxPermSize=256M -XX:+UseConcMarkSweepGC -XX:+CMSClassUnloadingEnabled &
\ No newline at end of file
diff --git a/Mage.Client/release/startClient.sh b/Mage.Client/release/startClient.sh
index 90f597dad3e..1ab1815bf3e 100644
--- a/Mage.Client/release/startClient.sh
+++ b/Mage.Client/release/startClient.sh
@@ -1,3 +1,3 @@
 #!/bin/sh
 
-java -jar ./lib/mage-client-${project.version}.jar -Xms256M -Xmx1024M -XX:MaxPermSize=256M &
\ No newline at end of file
+java -jar ./lib/mage-client-${project.version}.jar -Xms256M -Xmx1024M -XX:MaxPermSize=256M -XX:+UseConcMarkSweepGC -XX:+CMSClassUnloadingEnabled &
\ No newline at end of file
diff --git a/Mage.Client/release/startClientWin7.bat b/Mage.Client/release/startClientWin7.bat
index 57e708bc102..ca2e1dabeec 100644
--- a/Mage.Client/release/startClientWin7.bat
+++ b/Mage.Client/release/startClientWin7.bat
@@ -4,4 +4,4 @@ set JAVA_HOME="C:\Program Files (x86)\Java\jre6\"
 set CLASSPATH=%JAVA_HOME%/bin;%CLASSPATH%
 set PATH=%JAVA_HOME%/bin;%PATH%
 :NOJAVADIR
-start javaw -jar .\lib\mage-client-${project.version}.jar -Xms256M -Xmx1024M -XX:MaxPermSize=256M
\ No newline at end of file
+start javaw -jar .\lib\mage-client-${project.version}.jar -Xms256M -Xmx1024M -XX:MaxPermSize=256M -XX:+UseConcMarkSweepGC -XX:+CMSClassUnloadingEnabled
\ No newline at end of file