diff --git a/ci/run-cargo-test.sh b/ci/run-cargo-test.sh
index bc6eda2db..83f05a8f8 100755
--- a/ci/run-cargo-test.sh
+++ b/ci/run-cargo-test.sh
@@ -5,6 +5,9 @@ set -ex
 rustc --version
 cargo --version
 
+cpus=$(nproc || sysctl -n hw.ncpu)
+CARGO_FLAGS="-j${FDO_CI_CONCURRENT:-$cpus}"
+
 for crate in gstreamer* gstreamer-gl/{egl,wayland,x11}; do
     if [ -e "$crate/Cargo.toml" ]; then
         if [ -n "$ALL_FEATURES" ]; then
@@ -15,8 +18,8 @@ for crate in gstreamer* gstreamer-gl/{egl,wayland,x11}; do
 
         echo "Building and testing $crate with $FEATURES"
 
-        cargo build --locked --color=always --manifest-path "$crate/Cargo.toml" $FEATURES
-        RUST_BACKTRACE=1 G_DEBUG=fatal_warnings cargo test --color=always --manifest-path "$crate/Cargo.toml" $FEATURES
+        cargo build $CARGO_FLAGS --locked --color=always --manifest-path "$crate/Cargo.toml" $FEATURES
+        RUST_BACKTRACE=1 G_DEBUG=fatal_warnings cargo test $CARGO_FLAGS --color=always --manifest-path "$crate/Cargo.toml" $FEATURES
     fi
 done
 
@@ -25,6 +28,6 @@ if [ -n "$EXAMPLES_TUTORIALS" ]; then
     # List all features except windows/win32
     EXAMPLES_FEATURES="--features=rtsp-server,rtsp-server-record,pango-cairo,overlay-composition,gl,gst-gl-x11,gst-gl-egl,allocators,gst-play,gst-player,ges,image,cairo-rs,gst-video/v1_18"
 
-    cargo build --locked --color=always --manifest-path examples/Cargo.toml --bins --examples "$EXAMPLES_FEATURES"
-    cargo build --locked --color=always --manifest-path tutorials/Cargo.toml --bins --examples --all-features
+    cargo build $CARGO_FLAGS --locked --color=always --manifest-path examples/Cargo.toml --bins --examples "$EXAMPLES_FEATURES"
+    cargo build $CARGO_FLAGS --locked --color=always --manifest-path tutorials/Cargo.toml --bins --examples --all-features
 fi
diff --git a/ci/run-sys-cargo-test.sh b/ci/run-sys-cargo-test.sh
index 4aac0ddc5..106bb7d6c 100755
--- a/ci/run-sys-cargo-test.sh
+++ b/ci/run-sys-cargo-test.sh
@@ -5,10 +5,13 @@ set -ex
 rustc --version
 cargo --version
 
+cpus=$(nproc || sysctl -n hw.ncpu)
+CARGO_FLAGS="-j${FDO_CI_CONCURRENT:-$cpus}"
+
 for crate in gstreamer*/sys gstreamer-gl/*/sys; do
     if [ -e "$crate/Cargo.toml" ]; then
         echo "Building $crate with --all-features"
-        cargo build --locked --color=always --manifest-path "$crate/Cargo.toml" --all-features
+        cargo build $CARGO_FLAGS --locked --color=always --manifest-path "$crate/Cargo.toml" --all-features
     fi
 done
 
@@ -39,5 +42,5 @@ for crate in gstreamer/sys \
              gstreamer-video/sys \
              gstreamer-webrtc/sys; do
     echo "Testing $crate with --all-features)"
-    RUST_BACKTRACE=1 cargo test --locked --color=always --manifest-path $crate/Cargo.toml --all-features
+    RUST_BACKTRACE=1 cargo test $CARGO_FLAGS --locked --color=always --manifest-path $crate/Cargo.toml --all-features
 done