diff --git a/openwrtbuilder b/openwrtbuilder
index 412dde3..5c846aa 100755
--- a/openwrtbuilder
+++ b/openwrtbuilder
@@ -260,6 +260,8 @@ sshBackup() {
 makeImage() {
     debug "${FUNCNAME[0]}"
 
+    declare _nprocs
+
     # Reuse the existing output
     if [[ -d "${P_ARR[out_bin_dir]}" ]]; then
         if askOk "${P_ARR[out_bin_dir]} exists. Rebuild?"; then
@@ -271,9 +273,19 @@ makeImage() {
 
     [[ ! -d "${P_ARR[out_bin_dir]}" ]] && mkdir -p "${P_ARR[out_bin_dir]}"
 
+    _numcpus=$(nproc)
+    _numcpus=$(( _numcpus - 1 ))
+
+    # download image
+    debug "make download BIN_DIR=${P_ARR[out_bin_dir]} PROFILE=${P_ARR[profile]} PACKAGES=${P_ARR[packages]} FILES=$FILESDIR --directory=${P_ARR[source_dir]} > make.log"
+    if ! make download BIN_DIR="${P_ARR[out_bin_dir]}" PROFILE="${P_ARR[profile]}" PACKAGES="${P_ARR[packages]}" FILES="$FILESDIR" --directory="${P_ARR[source_dir]}" > make.log; then
+        echo "Make download failed!"
+        exit 1
+    fi
+
     # build image
-    debug "make -j4 image BIN_DIR=${P_ARR[out_bin_dir]} PROFILE=${P_ARR[profile]} PACKAGES=${P_ARR[packages]} FILES=$FILESDIR --directory=${P_ARR[source_dir]} > make.log"
-    if ! make image BIN_DIR="${P_ARR[out_bin_dir]}" PROFILE="${P_ARR[profile]}" PACKAGES="${P_ARR[packages]}" FILES="$FILESDIR" --directory="${P_ARR[source_dir]}" > make.log; then
+    debug "make -j$_numcpus image BIN_DIR=${P_ARR[out_bin_dir]} PROFILE=${P_ARR[profile]} PACKAGES=${P_ARR[packages]} FILES=$FILESDIR --directory=${P_ARR[source_dir]} >> make.log"
+    if ! make -j$_numcpus image BIN_DIR="${P_ARR[out_bin_dir]}" PROFILE="${P_ARR[profile]}" PACKAGES="${P_ARR[packages]}" FILES="$FILESDIR" --directory="${P_ARR[source_dir]}" >> make.log; then
         echo "Make image failed!"
         exit 1
     fi