diff --git a/Tools/autotest/sim_rover.sh b/Tools/autotest/sim_rover.sh
index 760274c57a..98012ef043 100755
--- a/Tools/autotest/sim_rover.sh
+++ b/Tools/autotest/sim_rover.sh
@@ -15,11 +15,11 @@ tfile=$(mktemp)
 echo r
 ) > $tfile
 #gnome-terminal -e "gdb -x $tfile --args /tmp/APMrover2.build/APMrover2.elf"
-gnome-terminal -e /tmp/APMrover2.build/APMrover2.elf
+gnome-terminal -e "nice /tmp/APMrover2.build/APMrover2.elf"
 #gnome-terminal -e "valgrind --db-attach=yes -q /tmp/APMrover2.build/APMrover2.elf"
 sleep 2
 rm -f $tfile
-gnome-terminal -e "../Tools/autotest/pysim/sim_rover.py --home=-35.362938,149.165085,584,270 --rate=400"
+gnome-terminal -e "nice ../Tools/autotest/pysim/sim_rover.py --home=-35.362938,149.165085,584,270 --rate=400"
 sleep 2
 popd
 mavproxy.py --aircraft=test --master tcp:127.0.0.1:5760 --sitl 127.0.0.1:5501 --out 127.0.0.1:14550 --out 127.0.0.1:14551