diff --git a/build/dimensioner.sh b/build/dimensioner.sh
index e4fe312..162107d 100755
--- a/build/dimensioner.sh
+++ b/build/dimensioner.sh
@@ -7,9 +7,9 @@ git clone https://github.com/micropython/micropython.git --branch=master --depth
 cd micropython
 make -C ports/rp2 clean
 make -C ports/rp2 submodules
-make -C mpy-cross
+make -j 4 -C mpy-cross
 cd ports/rp2
-make FROZEN_MANIFEST=../../../../src/dimensioner/manifest.py
+make -j 4 FROZEN_MANIFEST=../../../../src/dimensioner/manifest.py
 cd ../../../../
 mkdir -p out
 mv workspace/micropython/ports/rp2/build-RPI_PICO/firmware.uf2 out/dimensioner.uf2
diff --git a/build/kiosk-hid.sh b/build/kiosk-hid.sh
index 89d83c2..16ffcd1 100755
--- a/build/kiosk-hid.sh
+++ b/build/kiosk-hid.sh
@@ -8,9 +8,9 @@ git clone https://github.com/micropython/micropython.git --branch=master --depth
 cd micropython
 make -C ports/rp2 clean
 make -C ports/rp2 submodules
-make -C mpy-cross
+make -j 4 -C mpy-cross
 cd ports/rp2
-make FROZEN_MANIFEST=../../../../src/kiosk-hid/manifest.py
+make -j 4 FROZEN_MANIFEST=../../../../src/kiosk-hid/manifest.py
 cd ../../../../
 mkdir -p out
 mv workspace/micropython/ports/rp2/build-RPI_PICO/firmware.uf2 out/kiosk-hid.uf2