diff --git a/bin/start-slave.sh b/bin/start-slave.sh
index fd295b4a35af71e26a8b40add0c3357abb5cc7d3..c9707b88ba0f6a94e5a0836021d4058c6d04a9b6 100755
--- a/bin/start-slave.sh
+++ b/bin/start-slave.sh
@@ -17,6 +17,7 @@ if [ -f "$f" ]; then
 fi
 
 echo "This jenkins slave.jar will run as PID $$."
-export JAVA_ARGS="-Xms768M -Xmx768M"
-export MALLOC_ARENA_MAX=1
-exec java $JAVA_ARGS -jar /var/lib/jenkins/slave.jar
+#export JAVA_ARGS="-Xms768M -Xmx768M"
+#export MALLOC_ARENA_MAX=1
+#exec java $JAVA_ARGS -jar /var/lib/jenkins/slave.jar
+exec java -jar /var/lib/jenkins/slave.jar
diff --git a/hosts/jenkins/etc/default/jenkins b/hosts/jenkins/etc/default/jenkins
index 480f7e5c3b8e614f92bf7bb846cfeb43fa2c524e..a161d129d9d49e6025ff42807c32d7237049a07c 100644
--- a/hosts/jenkins/etc/default/jenkins
+++ b/hosts/jenkins/etc/default/jenkins
@@ -16,20 +16,21 @@ JAVA_ARGS="-Djava.awt.headless=true"
 
 #JAVA_ARGS="-Djava.net.preferIPv4Stack=true" # make jenkins listen on IPv4 address
 # See some recommendation from https://jenkins.io/blog/2016/11/21/gc-tuning/
-JAVA_ARGS="$JAVA_ARGS -Xms20G -Xmx20G"  # heap settings
-JAVA_ARGS="$JAVA_ARGS -server -XX:+AlwaysPreTouch"
+JAVA_ARGS="$JAVA_ARGS -Xms20G -Xmx40G"  # heap settings
+JAVA_ARGS="$JAVA_ARGS -server "
+#JAVA_ARGS="$JAVA_ARGS -XX:+AlwaysPreTouch"
 # store heap dumps in case of OOM, to investigate it later
-JAVA_ARGS="$JAVA_ARGS -XX:+HeapDumpOnOutOfMemoryError -XX:HeapDumpPath=$JENKINS_HOME/heapDumps/"
+#JAVA_ARGS="$JAVA_ARGS -XX:+HeapDumpOnOutOfMemoryError -XX:HeapDumpPath=$JENKINS_HOME/heapDumps/"
 # GC logging, in case somebody ever wants to actually finely tune the GC for us...
-JAVA_ARGS="$JAVA_ARGS -Xloggc:$JENKINS_HOME/javaGC/gc-%t.log -XX:NumberOfGCLogFiles=5"
-JAVA_ARGS="$JAVA_ARGS -XX:+UseGCLogFileRotation -XX:GCLogFileSize=20m -XX:+PrintGC"
-JAVA_ARGS="$JAVA_ARGS -XX:+PrintGCDateStamps -XX:+PrintGCDetails -XX:+PrintHeapAtGC"
-JAVA_ARGS="$JAVA_ARGS -XX:+PrintGCCause -XX:+PrintTenuringDistribution -XX:+PrintReferenceGC -XX:+PrintAdaptiveSizePolicy"
+#JAVA_ARGS="$JAVA_ARGS -Xloggc:$JENKINS_HOME/javaGC/gc-%t.log -XX:NumberOfGCLogFiles=5"
+#JAVA_ARGS="$JAVA_ARGS -XX:+UseGCLogFileRotation -XX:GCLogFileSize=20m -XX:+PrintGC"
+#JAVA_ARGS="$JAVA_ARGS -XX:+PrintGCDateStamps -XX:+PrintGCDetails -XX:+PrintHeapAtGC"
+#JAVA_ARGS="$JAVA_ARGS -XX:+PrintGCCause -XX:+PrintTenuringDistribution -XX:+PrintReferenceGC -XX:+PrintAdaptiveSizePolicy"
 # G1 GC settings
-JAVA_ARGS="$JAVA_ARGS -XX:+UseG1GC -XX:+ExplicitGCInvokesConcurrent -XX:+ParallelRefProcEnabled -XX:+UseStringDeduplication"
-JAVA_ARGS="$JAVA_ARGS -XX:+UnlockExperimentalVMOptions -XX:G1NewSizePercent=10 -XX:+UnlockDiagnosticVMOptions -XX:G1SummarizeRSetStatsPeriod=1"
+#JAVA_ARGS="$JAVA_ARGS -XX:+UseG1GC -XX:+ExplicitGCInvokesConcurrent -XX:+ParallelRefProcEnabled -XX:+UseStringDeduplication"
+#JAVA_ARGS="$JAVA_ARGS -XX:+UnlockExperimentalVMOptions -XX:G1NewSizePercent=10 -XX:+UnlockDiagnosticVMOptions -XX:G1SummarizeRSetStatsPeriod=1"
 # h01ger trying stuff
-export MALLOC_ARENA_MAX=1
+#export MALLOC_ARENA_MAX=1
 
 # make jenkins listen on IPv4 address
 #JAVA_ARGS="-Djava.net.preferIPv4Stack=true"