diff --git a/test/runsanitychecks.sh b/test/runsanitychecks.sh
index e5d14698..d7217d0d 100644
--- a/test/runsanitychecks.sh
+++ b/test/runsanitychecks.sh
@@ -4,7 +4,7 @@ clear
 cd sanity-check || exit 1
 echo "" > log.txt
 
-export CMAKE_BUILD_PARALLEL_LEVEL=$(nproc --all)
+export CMAKE_BUILD_PARALLEL_LEVEL=4
 
 ###############################################################################
 cd c++03 || exit 1
diff --git a/test/runtests.sh b/test/runtests.sh
index 259b9b1e..fbdf8049 100644
--- a/test/runtests.sh
+++ b/test/runtests.sh
@@ -16,7 +16,7 @@ echo "-----------------------------------------------" | tee -a log.txt
 rm * -rf
 gcc --version | grep gcc | tee -a log.txt
 cmake -DCMAKE_CXX_COMPILER="g++" -DCMAKE_C_COMPILER="gcc" -DNO_STL=OFF -DETL_USE_TYPE_TRAITS_BUILTINS=OFF -DETL_USE_MEM_BUILTINS=OFF -DETL_USER_DEFINED_TYPE_TRAITS=OFF -DETL_FORCE_TEST_CPP03_IMPLEMENTATION=OFF ..
-make -j8
+make -j4
 if [ $? -eq 0 ]; then
   echo "<<<< Passed Compilation >>>>"
 else
@@ -37,7 +37,7 @@ echo "-----------------------------------------------" | tee -a log.txt
 rm * -rf
 gcc --version | grep gcc | tee -a log.txt
 cmake -DCMAKE_CXX_COMPILER="g++" -DCMAKE_C_COMPILER="gcc" -DNO_STL=OFF -DETL_USE_TYPE_TRAITS_BUILTINS=OFF -DETL_USE_MEM_BUILTINS=OFF -DETL_USER_DEFINED_TYPE_TRAITS=OFF -DETL_FORCE_TEST_CPP03_IMPLEMENTATION=ON ..
-make -j8
+make -j4
 if [ $? -eq 0 ]; then
   echo "<<<< Passed Compilation >>>>"
 else
@@ -58,7 +58,7 @@ echo "-----------------------------------------------" | tee -a log.txt
 rm * -rf
 gcc --version | grep gcc | tee -a log.txt
 cmake -DCMAKE_CXX_COMPILER="g++" -DCMAKE_C_COMPILER="gcc" -DNO_STL=ON -DETL_USE_TYPE_TRAITS_BUILTINS=OFF -DETL_USE_MEM_BUILTINS=OFF -DETL_USER_DEFINED_TYPE_TRAITS=OFF -DETL_FORCE_TEST_CPP03_IMPLEMENTATION=OFF ..
-make -j8
+make -j4
 if [ $? -eq 0 ]; then
   echo "<<<< Passed Compilation >>>>"
 else
@@ -79,7 +79,7 @@ echo "-----------------------------------------------" | tee -a log.txt
 rm * -rf
 gcc --version | grep gcc | tee -a log.txt
 cmake -DCMAKE_CXX_COMPILER="g++" -DCMAKE_C_COMPILER="gcc" -DNO_STL=ON -DETL_USE_TYPE_TRAITS_BUILTINS=ON -DETL_USE_MEM_BUILTINS=ON -DETL_USER_DEFINED_TYPE_TRAITS=OFF -DETL_FORCE_TEST_CPP03_IMPLEMENTATION=OFF ..
-make -j8
+make -j4
 if [ $? -eq 0 ]; then
   echo "<<<< Passed Compilation >>>>"
 else
@@ -104,7 +104,7 @@ echo "-----------------------------------------------" | tee -a log.txt
 rm * -rf
 clang --version | grep clang | tee -a log.txt
 cmake -DCMAKE_CXX_COMPILER="clang++" -DCMAKE_C_COMPILER="clang" -DNO_STL=OFF -DETL_USE_TYPE_TRAITS_BUILTINS=OFF -DETL_USE_MEM_BUILTINS=OFF -DETL_USER_DEFINED_TYPE_TRAITS=OFF -DETL_FORCE_TEST_CPP03_IMPLEMENTATION=OFF ..
-make -j8
+make -j4
 if [ $? -eq 0 ]; then
   echo "<<<< Passed Compilation >>>>"
 else
@@ -125,7 +125,7 @@ echo "-----------------------------------------------" | tee -a log.txt
 rm * -rf
 clang --version | grep clang | tee -a log.txt
 cmake -DCMAKE_CXX_COMPILER="clang++" -DCMAKE_C_COMPILER="clang" -DNO_STL=OFF -DETL_USE_TYPE_TRAITS_BUILTINS=OFF -DETL_USE_MEM_BUILTINS=OFF -DETL_USER_DEFINED_TYPE_TRAITS=OFF -DETL_FORCE_TEST_CPP03_IMPLEMENTATION=ON ..
-make -j8
+make -j4
 if [ $? -eq 0 ]; then
   echo "<<<< Passed Compilation >>>>"
 else
@@ -146,7 +146,7 @@ echo "-----------------------------------------------" | tee -a log.txt
 rm * -rf
 clang --version | grep clang | tee -a log.txt
 cmake -DCMAKE_CXX_COMPILER="clang++" -DCMAKE_C_COMPILER="clang" -DNO_STL=ON -DETL_USE_TYPE_TRAITS_BUILTINS=OFF -DETL_USE_MEM_BUILTINS=OFF -DETL_USER_DEFINED_TYPE_TRAITS=OFF -DETL_FORCE_TEST_CPP03_IMPLEMENTATION=OFF ..
-make -j8
+make -j4
 if [ $? -eq 0 ]; then
   echo "<<<< Passed Compilation >>>>"
 else
@@ -167,7 +167,7 @@ echo "-----------------------------------------------" | tee -a log.txt
 rm * -rf
 clang --version | grep clang | tee -a log.txt
 cmake -DCMAKE_CXX_COMPILER="clang++" -DCMAKE_C_COMPILER="clang" -DNO_STL=ON -DETL_USE_TYPE_TRAITS_BUILTINS=ON -DETL_USE_MEM_BUILTINS=ON -DETL_USER_DEFINED_TYPE_TRAITS=OFF -DETL_FORCE_TEST_CPP03_IMPLEMENTATION=OFF ..
-make -j8
+make -j4
 if [ $? -eq 0 ]; then
   echo "<<<< Passed Compilation >>>>"
 else
@@ -192,7 +192,7 @@ cd build-make || exit 1
 rm * -rf
 gcc --version | grep gcc | tee -a log.txt
 cmake -DCMAKE_CXX_COMPILER="g++" -DCMAKE_C_COMPILER="gcc" ..
-make -j8
+make -j4
 if [ $? -eq 0 ]; then
   echo "<<<< Passed initializer_list Compilation >>>>"
 else
@@ -214,7 +214,7 @@ echo "-----------------------------------------------" | tee -a log.txt
 rm * -rf
 clang --version | grep clang | tee -a log.txt
 cmake -DCMAKE_CXX_COMPILER="clang++" -DCMAKE_C_COMPILER="clang" ..
-make -j8
+make -j4
 if [ $? -eq 0 ]; then
   echo "<<<< Passed initializer_list Compilation >>>>"
 else
@@ -239,7 +239,7 @@ cd build-make || exit 1
 rm * -rf
 gcc --version | grep gcc | tee -a log.txt
 cmake -DCMAKE_CXX_COMPILER="g++" -DCMAKE_C_COMPILER="gcc" ..
-make -j8
+make -j4
 if [ $? -eq 0 ]; then
   echo "<<<< Passed Error macros 'log_errors' Compilation >>>>"
 else
@@ -264,7 +264,7 @@ cd build-make || exit 1
 rm * -rf
 gcc --version | grep gcc | tee -a log.txt
 cmake -DCMAKE_CXX_COMPILER="g++" -DCMAKE_C_COMPILER="gcc" ..
-make -j8
+make -j4
 if [ $? -eq 0 ]; then
   echo "<<<< Passed Error macros 'exceptions' Compilation >>>>"
 else
@@ -289,7 +289,7 @@ cd build-make || exit 1
 rm * -rf
 gcc --version | grep gcc | tee -a log.txt
 cmake -DCMAKE_CXX_COMPILER="g++" -DCMAKE_C_COMPILER="gcc" ..
-make -j8
+make -j4
 if [ $? -eq 0 ]; then
   echo "<<<< Passed Error macros 'log_errors and exceptions' Compilation >>>>"
 else
@@ -314,7 +314,7 @@ cd build-make || exit 1
 rm * -rf
 clang --version | grep clang | tee -a log.txt
 cmake -DCMAKE_CXX_COMPILER="clang++" -DCMAKE_C_COMPILER="clang" ..
-make -j8
+make -j4
 if [ $? -eq 0 ]; then
   echo "<<<< Passed Error macros 'log_errors' Compilation >>>>"
 else
@@ -339,7 +339,7 @@ cd build-make || exit 1
 rm * -rf
 clang --version | grep clang | tee -a log.txt
 cmake -DCMAKE_CXX_COMPILER="clang++" -DCMAKE_C_COMPILER="clang" ..
-make -j8
+make -j4
 if [ $? -eq 0 ]; then
   echo "<<<< Passed Error macros 'exceptions' Compilation >>>>"
 else
@@ -364,7 +364,7 @@ cd build-make || exit 1
 rm * -rf
 clang --version | grep clang | tee -a log.txt
 cmake -DCMAKE_CXX_COMPILER="clang++" -DCMAKE_C_COMPILER="clang" ..
-make -j8
+make -j4
 if [ $? -eq 0 ]; then
   echo "<<<< Passed Error macros 'log_errors and exceptions' Compilation >>>>"
 else