diff --git a/lib/build-all-ng.sh b/lib/build-all-ng.sh
index 4947212fd2..a3447c6fbd 100644
--- a/lib/build-all-ng.sh
+++ b/lib/build-all-ng.sh
@@ -325,11 +325,9 @@ function build_all()
 			fi
 			if [[ "$store_hash" != idential ]]; then
 
-			((n+=1))
-
 			if [[ $1 != "dryrun" ]] && [[ $n -ge $START ]]; then
-
-							while :
+					((n+=1))
+						while :
 							do
 							if [[ $(find /run/armbian/*.pid 2>/dev/null | wc -l) -le ${MULTITHREAD} || ${MULTITHREAD} -eq 0  ]]; then
 								break
@@ -340,13 +338,17 @@ function build_all()
 					display_alert "Building ${n}."
 					if [[ "$KERNEL_ONLY" == "no" && "${MULTITHREAD}" -gt 0 ]]; then
 						build_main &
+						sleep $((RANDOM % 5))
+					elif [[ "${MULTITHREAD}" -gt 0 ]]; then
+						build_main &
+						sleep $((RANDOM % 5))
 					else
 						build_main
 					fi
 
 			# create BSP for all boards
 			elif [[ "${BSP_BUILD}" == yes ]]; then
-
+				((n+=1))
 				for BOARD in "${unique_boards[@]}"
 				do
 					# shellcheck source=/dev/null
@@ -368,8 +370,11 @@ function build_all()
 						display_alert "BSP for ${BOARD} ${BRANCH} ${RELEASE}."
 						if [[ "$IGNORE_HASH" == yes && "$KERNEL_ONLY" != "yes" && "${MULTITHREAD}" -gt 0 ]]; then
 							build_main &
-							sleep 0.5
-							else
+							sleep 0.02
+						elif [[ "${MULTITHREAD}" -gt 0 ]]; then
+							build_main &
+							sleep $((RANDOM % 5))
+						else
 							build_main
 						fi
 						# unset non board related stuff
@@ -380,6 +385,7 @@ function build_all()
 				display_alert "Done building all BSP images"
 				exit
 			else
+				((n+=1))
 				# In dryrun it only prints out what will be build
                                 printf "%s\t%-32s\t%-8s\t%-14s\t%-6s\t%-6s\t%-6s\n" "${n}." \
                                 "$BOARD (${BOARDFAMILY})" "${BRANCH}" "${RELEASE}" "${BUILD_DESKTOP}" "${BUILD_MINIMAL}"
@@ -454,4 +460,4 @@ fi
 buildall_end=$(date +%s)
 buildall_runtime=$(((buildall_end - buildall_start) / 60))
 display_alert "Runtime in total" "${buildall_runtime} min" "info"
-echo "${n}" > "${SRC}"/.tmp/n
+export n=${n}
diff --git a/lib/compilation.sh b/lib/compilation.sh
index ffefbdbe66..2c3534c1d8 100644
--- a/lib/compilation.sh
+++ b/lib/compilation.sh
@@ -80,6 +80,8 @@ compile_atf()
 	[[ $(type -t atf_custom_postprocess) == function ]] && atf_custom_postprocess
 
 	atftempdir=$(mktemp -d)
+	chmod 700 ${atftempdir}
+	trap "rm -rf \"${atftempdir}\" ; exit 0" 0 1 2 3 15
 
 	# copy files to temp directory
 	for f in $target_files; do
@@ -144,6 +146,8 @@ compile_uboot()
 
 	# create directory structure for the .deb package
 	uboottempdir=$(mktemp -d)
+	chmod 700 ${uboottempdir}
+	trap "rm -rf \"${uboottempdir}\" ; exit 0" 0 1 2 3 15
 	local uboot_name=${CHOSEN_UBOOT}_${REVISION}_${ARCH}
 	rm -rf $uboottempdir/$uboot_name
 	mkdir -p $uboottempdir/$uboot_name/usr/lib/{u-boot,$uboot_name} $uboottempdir/$uboot_name/DEBIAN
@@ -275,7 +279,7 @@ compile_uboot()
 
 	[[ ! -f $uboottempdir/${uboot_name}.deb ]] && exit_with_error "Building u-boot package failed"
 
-	rsync -rq "$uboottempdir/${uboot_name}.deb" "${DEB_STORAGE}/"
+	rsync --remove-source-files -rq "$uboottempdir/${uboot_name}.deb" "${DEB_STORAGE}/"
 }
 
 compile_kernel()
@@ -319,8 +323,8 @@ compile_kernel()
 
 	# create linux-source package - with already patched sources
 	local sources_pkg_dir=$(mktemp -d)/${CHOSEN_KSRC}_${REVISION}_all
-	rm -rf "${sources_pkg_dir}"
-	mkdir -p "${sources_pkg_dir}"/usr/src/ "${sources_pkg_dir}/usr/share/doc/linux-source-${version}-${LINUXFAMILY}" "${sources_pkg_dir}"/DEBIAN
+	trap "rm -rf \"${sources_pkg_dir}\" ; exit 0" 0 1 2 3 15
+	mkdir -p "${sources_pkg_dir}"/usr/src/ "${sources_pkg_dir}"/usr/share/doc/linux-source-${version}-${LINUXFAMILY} "${sources_pkg_dir}"/DEBIAN
 
 	if [[ $BUILD_KSRC != no ]]; then
 		display_alert "Compressing sources for the linux-source package"
@@ -329,7 +333,6 @@ compile_kernel()
 			| pixz -4 > "${sources_pkg_dir}/usr/src/linux-source-${version}-${LINUXFAMILY}.tar.xz"
 		cp COPYING "${sources_pkg_dir}/usr/share/doc/linux-source-${version}-${LINUXFAMILY}/LICENSE"
 	fi
-
 	display_alert "Compiling $BRANCH kernel" "$version" "info"
 
 	local toolchain
@@ -447,14 +450,15 @@ compile_kernel()
 
 	if [[ $BUILD_KSRC != no ]]; then
 		fakeroot dpkg-deb -z0 -b "${sources_pkg_dir}" "${sources_pkg_dir}.deb"
-		rsync -rq "${sources_pkg_dir}.deb" "${DEB_STORAGE}/"
+		rsync --remove-source-files -rq "${sources_pkg_dir}.deb" "${DEB_STORAGE}/"
 	fi
 	rm -rf "${sources_pkg_dir}"
 
 	cd .. || exit
 	# remove firmare image packages here - easier than patching ~40 packaging scripts at once
 	rm -f linux-firmware-image-*.deb
-	rsync -rq ./*.deb "${DEB_STORAGE}/" || exit_with_error "Failed moving kernel DEBs"
+
+	rsync --remove-source-files -rq ./*.deb "${DEB_STORAGE}/" || exit_with_error "Failed moving kernel DEBs"
 
 	# store git hash to the file
 	echo "${hash}" > "${SRC}/cache/hash"$([[ ${BETA} == yes ]] && echo "-beta")"/linux-image-${BRANCH}-${LINUXFAMILY}.githash"
@@ -479,7 +483,8 @@ compile_firmware()
 	fi
 
 	firmwaretempdir=$(mktemp -d)
-
+	chmod 700 ${firmwaretempdir}
+	trap "rm -rf \"${firmwaretempdir}\" ; exit 0" 0 1 2 3 15
 	local plugin_dir="armbian-firmware${FULL}"
 	mkdir -p "${firmwaretempdir}/${plugin_dir}/lib/firmware"
 
@@ -529,7 +534,8 @@ compile_armbian-config()
 {
 
 	local tmpdir=$(mktemp -d)/armbian-config_${REVISION}_all
-
+	chmod 700 ${tmpdir}
+	trap "rm -rf \"${tmpdir}\" ; exit 0" 0 1 2 3 15
 	display_alert "Building deb" "armbian-config" "info"
 
 	fetch_from_repo "https://github.com/armbian/config" "armbian-config" "branch:master"
diff --git a/lib/debootstrap.sh b/lib/debootstrap.sh
index f2ec880829..1cf9c34c7b 100644
--- a/lib/debootstrap.sh
+++ b/lib/debootstrap.sh
@@ -418,8 +418,12 @@ prepare_partitions()
 
 	# stage: create blank image
 	display_alert "Creating blank image for rootfs" "$sdsize MiB" "info"
-	# truncate --size=${sdsize}M ${SDCARD}.raw # sometimes results in fs corruption, revert to previous know to work solution
-	dd if=/dev/zero bs=1M status=none count=$sdsize | pv -p -b -r -s $(( $sdsize * 1024 * 1024 )) -N "[ .... ] dd" | dd status=none of=${SDCARD}.raw
+	if [[ $FAST_CREATE_IMAGE == yes ]]; then
+		truncate --size=${sdsize}M ${SDCARD}.raw # sometimes results in fs corruption, revert to previous know to work solution
+		sync
+	else
+		dd if=/dev/zero bs=1M status=none count=$sdsize | pv -p -b -r -s $(( $sdsize * 1024 * 1024 )) -N "[ .... ] dd" | dd status=none of=${SDCARD}.raw
+	fi
 
 	# stage: calculate boot partition size
 	local bootstart=$(($OFFSET * 2048))
diff --git a/lib/makeboarddeb.sh b/lib/makeboarddeb.sh
index ac1c13a742..3f3874c446 100644
--- a/lib/makeboarddeb.sh
+++ b/lib/makeboarddeb.sh
@@ -17,8 +17,10 @@ create_board_package()
 {
 	display_alert "Creating board support package" "$BOARD $BRANCH" "info"
 
-	local destination=$(mktemp -d)/${RELEASE}/${CHOSEN_ROOTFS}_${REVISION}_${ARCH}
-	rm -rf "${destination}"
+	bsptempdir=$(mktemp -d)
+	chmod 700 ${bsptempdir}
+	trap "rm -rf \"${bsptempdir}\" ; exit 0" 0 1 2 3 15
+	local destination=${bsptempdir}/${RELEASE}/${CHOSEN_ROOTFS}_${REVISION}_${ARCH}
 	mkdir -p "${destination}"/DEBIAN
 	cd $destination
 
@@ -307,7 +309,7 @@ fi
 	display_alert "Building package" "$CHOSEN_ROOTFS" "info"
 	fakeroot dpkg-deb -b "${destination}" "${destination}.deb" >> "${DEST}"/debug/install.log 2>&1
 	mkdir -p "${DEB_STORAGE}/${RELEASE}/"
-	rsync -rq --delete-after "${destination}.deb" "${DEB_STORAGE}/${RELEASE}/"
+	rsync --remove-source-files -rq "${destination}.deb" "${DEB_STORAGE}/${RELEASE}/"
 	# cleanup
-	rm -rf "${destination}"
+	rm -rf ${bsptempdir}
 }