diff --git a/px3se/mk-kernel.sh b/px3se/mk-kernel.sh
index 6b0df9a..5f5be5b 100755
--- a/px3se/mk-kernel.sh
+++ b/px3se/mk-kernel.sh
@@ -1,6 +1,12 @@
 #!/bin/bash
 
-cd kernel && make ARCH=arm rockchip_linux_defconfig && make ARCH=arm px3se-evb.img -j12 && cd -
+#
+# Do a parallel build with multiple jobs, based on the number of CPUs online
+# in this system: 'make -j8' on a 8-CPU system, etc.
+#
+JOBS=$(grep -c ^processor /proc/cpuinfo)
+
+cd kernel && make ARCH=arm rockchip_linux_defconfig && make ARCH=arm px3se-evb.img -j$JOBS && cd -
 
 if [ $? -eq 0 ]; then
     echo "====Build kernel ok!===="
diff --git a/px3se/mk-rootfs.sh b/px3se/mk-rootfs.sh
index 8a76f8d..6084657 100755
--- a/px3se/mk-rootfs.sh
+++ b/px3se/mk-rootfs.sh
@@ -2,7 +2,7 @@
 #buildroot defconfig
 LUNCH=rockchip_px3se
 #build jobs
-JOBS=12
+JOBS=$(grep -c ^processor /proc/cpuinfo)
 TOP_DIR=$(pwd)
 source buildroot/build/envsetup.sh $LUNCH
 TARGET_PRODUCT=`get_target_board_type $LUNCH`
@@ -13,7 +13,7 @@ echo "$BUILD_CONFIG"
 ROOTFS_IMAGE=buildroot/output/$BUILD_CONFIG/images/rootfs.img
 # build rootfs
 echo "====Start build rootfs===="
-make
+make -j$JOBS
 if [ $? -eq 0 ]; then
     echo "====Build rootfs ok!===="
 else
diff --git a/rk3288/mk-kernel.sh b/rk3288/mk-kernel.sh
index 7089f1b..7781baf 100755
--- a/rk3288/mk-kernel.sh
+++ b/rk3288/mk-kernel.sh
@@ -1,6 +1,12 @@
 #!/bin/bash
 
-cd kernel && make ARCH=arm rockchip_linux_defconfig && make ARCH=arm rk3288-evb-rk808-linux.img -j12 && cd -
+#
+# Do a parallel build with multiple jobs, based on the number of CPUs online
+# in this system: 'make -j8' on a 8-CPU system, etc.
+#
+JOBS=$(grep -c ^processor /proc/cpuinfo)
+
+cd kernel && make ARCH=arm rockchip_linux_defconfig && make ARCH=arm rk3288-evb-rk808-linux.img -j$JOBS && cd -
 
 if [ $? -eq 0 ]; then
     echo "====Build kernel ok!===="
diff --git a/rk3288/mk-rootfs.sh b/rk3288/mk-rootfs.sh
index 3497285..59d2da2 100755
--- a/rk3288/mk-rootfs.sh
+++ b/rk3288/mk-rootfs.sh
@@ -2,7 +2,7 @@
 #buildroot defconfig
 LUNCH=rockchip_rk3288
 #build jobs
-JOBS=12
+JOBS=$(grep -c ^processor /proc/cpuinfo)
 TOP_DIR=$(pwd)
 source buildroot/build/envsetup.sh $LUNCH
 TARGET_PRODUCT=`get_target_board_type $LUNCH`
@@ -13,7 +13,7 @@ echo "$BUILD_CONFIG"
 ROOTFS_IMAGE=buildroot/output/$BUILD_CONFIG/images/rootfs.img
 # build rootfs
 echo "====Start build rootfs===="
-make
+make -j$JOBS
 if [ $? -eq 0 ]; then
     echo "====Build rootfs ok!===="
 else
diff --git a/rk3326/mk-kernel.sh b/rk3326/mk-kernel.sh
index 4b21e5a..11aa865 100755
--- a/rk3326/mk-kernel.sh
+++ b/rk3326/mk-kernel.sh
@@ -1,6 +1,12 @@
 #!/bin/bash
 
-cd kernel && make ARCH=arm64 rk3326_linux_defconfig && make ARCH=arm64 rk3326-evb-linux-lp3-v10.img -j12 && cd -
+#
+# Do a parallel build with multiple jobs, based on the number of CPUs online
+# in this system: 'make -j8' on a 8-CPU system, etc.
+#
+JOBS=$(grep -c ^processor /proc/cpuinfo)
+
+cd kernel && make ARCH=arm64 rk3326_linux_defconfig && make ARCH=arm64 rk3326-evb-linux-lp3-v10.img -j$JOBS && cd -
 
 if [ $? -eq 0 ]; then
     echo "====Build kernel ok!===="
diff --git a/rk3326/mk-rootfs.sh b/rk3326/mk-rootfs.sh
index f49a69d..c366ad7 100755
--- a/rk3326/mk-rootfs.sh
+++ b/rk3326/mk-rootfs.sh
@@ -2,7 +2,7 @@
 #buildroot defconfig
 LUNCH=rockchip_rk3326
 #build jobs
-JOBS=12
+JOBS=$(grep -c ^processor /proc/cpuinfo)
 TOP_DIR=$(pwd)
 source buildroot/build/envsetup.sh $LUNCH
 TARGET_PRODUCT=`get_target_board_type $LUNCH`
@@ -13,7 +13,7 @@ echo "$BUILD_CONFIG"
 ROOTFS_IMAGE=buildroot/output/$BUILD_CONFIG/images/rootfs.img
 # build rootfs
 echo "====Start build rootfs===="
-make
+make -j$JOBS
 if [ $? -eq 0 ]; then
     echo "====Build rootfs ok!===="
 else
diff --git a/rk3399/mk-kernel.sh b/rk3399/mk-kernel.sh
index 3ab47b4..c262230 100755
--- a/rk3399/mk-kernel.sh
+++ b/rk3399/mk-kernel.sh
@@ -1,6 +1,12 @@
 #!/bin/bash
 
-cd kernel && make ARCH=arm64 rockchip_linux_defconfig && make ARCH=arm64 rk3399-sapphire-excavator-linux.img -j12 && cd -
+#
+# Do a parallel build with multiple jobs, based on the number of CPUs online
+# in this system: 'make -j8' on a 8-CPU system, etc.
+#
+JOBS=$(grep -c ^processor /proc/cpuinfo)
+
+cd kernel && make ARCH=arm64 rockchip_linux_defconfig && make ARCH=arm64 rk3399-sapphire-excavator-linux.img -j$JOBS && cd -
 
 if [ $? -eq 0 ]; then
     echo "====Build kernel ok!===="
diff --git a/rk3399/mk-rootfs.sh b/rk3399/mk-rootfs.sh
index 1c950f5..15fbf52 100755
--- a/rk3399/mk-rootfs.sh
+++ b/rk3399/mk-rootfs.sh
@@ -2,7 +2,7 @@
 #buildroot defconfig
 LUNCH=rockchip_rk3399
 #build jobs
-JOBS=12
+JOBS=$(grep -c ^processor /proc/cpuinfo)
 TOP_DIR=$(pwd)
 source buildroot/build/envsetup.sh $LUNCH
 TARGET_PRODUCT=`get_target_board_type $LUNCH`
@@ -13,7 +13,7 @@ echo "$BUILD_CONFIG"
 ROOTFS_IMAGE=buildroot/output/$BUILD_CONFIG/images/rootfs.img
 # build rootfs
 echo "====Start build rootfs===="
-make
+make -j$JOBS
 if [ $? -eq 0 ]; then
     echo "====Build rootfs ok!===="
 else