diff --git a/tests/test_automation/github-actions/ci/run_step.sh b/tests/test_automation/github-actions/ci/run_step.sh
index fd68dfa8d4..7a93ed4155 100755
--- a/tests/test_automation/github-actions/ci/run_step.sh
+++ b/tests/test_automation/github-actions/ci/run_step.sh
@@ -323,8 +323,22 @@ case "$1" in
     then 
        source /opt/intel2020/mkl/bin/mklvars.sh intel64
     fi
+
+    # Add ctest concurrent parallel jobs 
+    # Default for Linux GitHub Action runners
+    CTEST_JOBS="2"
+    # Default for macOS GitHub Action runners
+    if [[ "${GH_OS}" =~ (macOS) ]]
+    then
+      CTEST_JOBS="3"
+    fi
+
+    if [[ "$HOST_NAME" =~ (sulfur) || "$HOST_NAME" =~ (nitrogen) ]]
+    then
+      CTEST_JOBS="16"
+    fi
     
-    ctest --output-on-failure $TEST_LABEL
+    ctest --output-on-failure $TEST_LABEL -j $CTEST_JOBS
     ;;
   
   # Generate coverage reports