diff --git a/tests.sh b/tests.sh
index 1a18386..a6c56e2 100755
--- a/tests.sh
+++ b/tests.sh
@@ -33,7 +33,12 @@ cur=`dirname $(readlink -f "${0}")`
 export COVERAGE_FILE="${cur}/.coverage"
 
 # execute tests with coverage
-PYTHONPATH="dotdrop" ${nosebin} -s --with-coverage --cover-package=dotdrop
+if [ -z ${GITHUB_WORKFLOW} ]; then
+  #PYTHONPATH="dotdrop" ${nosebin} --processes=0 --with-coverage --cover-package=dotdrop
+  PYTHONPATH="dotdrop" ${nosebin} -s --processes=-1 --with-coverage --cover-package=dotdrop
+else
+  PYTHONPATH="dotdrop" ${nosebin} --processes=-1 --with-coverage --cover-package=dotdrop
+fi
 #PYTHONPATH="dotdrop" python3 -m pytest tests
 
 # enable debug logs