diff --git a/bin/start-slave.sh b/bin/start-slave.sh
index 871de3d676e816f4160aae4e848efc253f7b0373..91367411e1766d32c185a231d3ac8cdfafc15534 100755
--- a/bin/start-slave.sh
+++ b/bin/start-slave.sh
@@ -17,7 +17,7 @@ if [ -f "$f" ]; then
 fi
 
 echo "This jenkins slave.jar will run as PID $$."
-export JAVA_ARGS="-Xmn128M -Xms1G -Xmx1G -client"
-export MALLOC_ARENA_MAX=1
-sleep 120m
+#export JAVA_ARGS="-Xmn128M -Xms1G -Xmx1G -client"
+export JAVA_ARGS="-Xmx2G"
+#export MALLOC_ARENA_MAX=1
 exec java $JAVA_ARGS -jar /var/lib/jenkins/slave.jar
diff --git a/hosts/jenkins/etc/default/jenkins b/hosts/jenkins/etc/default/jenkins
index ac5ca966aaa8ed871c3354cada8e589bb4659581..fd84ed7def3c6359303d6615d46ee165a3e7a913 100644
--- a/hosts/jenkins/etc/default/jenkins
+++ b/hosts/jenkins/etc/default/jenkins
@@ -16,9 +16,10 @@ 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="$JAVA_ARGS -Xmn1G -Xms24G -Xmx24G"  # heap settings
-JAVA_ARGS="$JAVA_ARGS -server "
-JAVA_ARGS="$JAVA_ARGS -XX:+AlwaysPreTouch"
+JAVA_ARGS="$JAVA_ARGS -Xmx16G"  # heap settings
+#JAVA_ARGS="$JAVA_ARGS -Xmn1G -Xms24G -Xmx24G"  # heap settings
+#JAVA_ARGS="$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=$JENKINS_HOME/heapDumps/"
 # GC logging, in case somebody ever wants to actually finely tune the GC for us...
@@ -27,11 +28,11 @@ JAVA_ARGS="$JAVA_ARGS -XX:+AlwaysPreTouch"
 #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="$JAVA_ARGS -XX:+UseG1GC "
+#JAVA_ARGS="$JAVA_ARGS -XX:+UseG1GC "
 #JAVA_ARGS="$JAVA_ARGS -XX:+ExplicitGCInvokesConcurrent -XX:+ParallelRefProcEnabled -XX:+UseStringDeduplication"
 #JAVA_ARGS="$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"