diff --git a/integration_tests/CMakeLists.txt b/integration_tests/CMakeLists.txt
index 72437cb3b9..6ec1ae8a7c 100644
--- a/integration_tests/CMakeLists.txt
+++ b/integration_tests/CMakeLists.txt
@@ -64,154 +64,150 @@ message("LPYTHON_RTLIB_DIR: ${LPYTHON_RTLIB_DIR}")
 message("LPYTHON_RTLIB_LIBRARY: ${LPYTHON_RTLIB_LIBRARY}")
 
 
+macro(RUN_UTIL RUN_FAIL RUN_NAME RUN_FILE_NAME RUN_IMPORT_PATH RUN_LABELS RUN_ENABLE_CPYTHON RUN_EXTRAFILES RUN_EXTRA_ARGS)
+    set(fail ${${RUN_FAIL}})
+    set(name ${${RUN_NAME}})
+    set(file_name ${${RUN_FILE_NAME}})
+    set(import_path ${${RUN_IMPORT_PATH}})
+    set(labels ${${RUN_LABELS}})
+    set(run_enable_cpython ${${RUN_ENABLE_CPYTHON}})
+    set(extra_files ${${RUN_EXTRAFILES}})
+    set(extra_args ${${RUN_EXTRA_ARGS}})
 
-macro(RUN)
-    set(options FAIL ENABLE_CPYTHON)
-    set(oneValueArgs NAME IMPORT_PATH)
-    set(multiValueArgs LABELS EXTRAFILES)
-    cmake_parse_arguments(RUN "${options}" "${oneValueArgs}"
-                          "${multiValueArgs}" ${ARGN} )
-    set(name ${RUN_NAME})
-    set(import_path ${RUN_IMPORT_PATH})
     if (NOT name)
         message(FATAL_ERROR "Must specify the NAME argument")
     endif()
 
-    set(enable_cpython "")
-    if (${RUN_ENABLE_CPYTHON})
-        set(enable_cpython "--enable-cpython")
-    endif()
-
-    if (${KIND} IN_LIST RUN_LABELS)
+    if (${KIND} IN_LIST labels)
         if (KIND STREQUAL "llvm")
             if (import_path)
                 add_custom_command(
                     OUTPUT ${name}.o
-                    COMMAND ${LPYTHON} -c -I ${CMAKE_CURRENT_SOURCE_DIR}/${import_path} ${CMAKE_CURRENT_SOURCE_DIR}/${name}.py -o ${name}.o
-                    DEPENDS ${CMAKE_CURRENT_SOURCE_DIR}/${name}.py
+                    COMMAND ${LPYTHON} -c -I ${CMAKE_CURRENT_SOURCE_DIR}/${import_path} ${extra_args} ${CMAKE_CURRENT_SOURCE_DIR}/${file_name}.py -o ${name}.o
+                    DEPENDS ${CMAKE_CURRENT_SOURCE_DIR}/${file_name}.py
                     VERBATIM)
             else ()
                 add_custom_command(
                     OUTPUT ${name}.o
-                    COMMAND ${LPYTHON} -c ${CMAKE_CURRENT_SOURCE_DIR}/${name}.py -o ${name}.o
-                    DEPENDS ${CMAKE_CURRENT_SOURCE_DIR}/${name}.py
+                    COMMAND ${LPYTHON} -c ${extra_args} ${CMAKE_CURRENT_SOURCE_DIR}/${file_name}.py -o ${name}.o
+                    DEPENDS ${CMAKE_CURRENT_SOURCE_DIR}/${file_name}.py
                     VERBATIM)
             endif()
-            add_executable(${name} ${name}.o ${RUN_EXTRAFILES})
+            add_executable(${name} ${name}.o ${extra_files})
             set_target_properties(${name} PROPERTIES LINKER_LANGUAGE C)
             target_link_libraries(${name} lpython_rtlib)
             add_test(${name} ${CMAKE_CURRENT_BINARY_DIR}/${name})
-            if (RUN_LABELS)
-                set_tests_properties(${name} PROPERTIES LABELS "${RUN_LABELS}")
+            if (labels)
+                set_tests_properties(${name} PROPERTIES LABELS "${labels}")
             endif()
-            if (${RUN_FAIL})
+            if (${fail})
                 set_tests_properties(${name} PROPERTIES WILL_FAIL TRUE)
             endif()
         elseif(KIND STREQUAL "c")
             if (import_path)
                 add_custom_command(
                     OUTPUT ${name}.c
-                    COMMAND ${LPYTHON} ${enable_cpython} -I ${CMAKE_CURRENT_SOURCE_DIR}/${import_path} --show-c ${CMAKE_CURRENT_SOURCE_DIR}/${name}.py > ${name}.c
-                    DEPENDS ${CMAKE_CURRENT_SOURCE_DIR}/${name}.py
+                    COMMAND ${LPYTHON} ${extra_args} -I ${CMAKE_CURRENT_SOURCE_DIR}/${import_path} --show-c ${CMAKE_CURRENT_SOURCE_DIR}/${file_name}.py > ${name}.c
+                    DEPENDS ${CMAKE_CURRENT_SOURCE_DIR}/${file_name}.py
                     VERBATIM)
             else ()
                 add_custom_command(
                     OUTPUT ${name}.c
-                    COMMAND ${LPYTHON} ${enable_cpython} --show-c ${CMAKE_CURRENT_SOURCE_DIR}/${name}.py > ${name}.c
-                    DEPENDS ${CMAKE_CURRENT_SOURCE_DIR}/${name}.py
+                    COMMAND ${LPYTHON} ${extra_args} --show-c ${CMAKE_CURRENT_SOURCE_DIR}/${file_name}.py > ${name}.c
+                    DEPENDS ${CMAKE_CURRENT_SOURCE_DIR}/${file_name}.py
                     VERBATIM)
             endif()
 
-            add_executable(${name} ${name}.c ${RUN_EXTRAFILES})
+            add_executable(${name} ${name}.c ${extra_files})
             target_include_directories(${name} PRIVATE ${CMAKE_SOURCE_DIR})
             set_target_properties(${name} PROPERTIES LINKER_LANGUAGE C)
             target_link_libraries(${name} lpython_rtlib)
-            if (${RUN_ENABLE_CPYTHON})
+            if (run_enable_cpython)
                 target_link_libraries(${name} Python::Python)
-                if (RUN_EXTRAFILES)
-                    file(COPY ${CMAKE_CURRENT_SOURCE_DIR}/${RUN_EXTRAFILES} DESTINATION ${CMAKE_CURRENT_BINARY_DIR})
+                if (extra_files)
+                    file(COPY ${CMAKE_CURRENT_SOURCE_DIR}/${extra_files} DESTINATION ${CMAKE_CURRENT_BINARY_DIR})
                 endif()
             endif()
             add_test(${name} ${CMAKE_CURRENT_BINARY_DIR}/${name})
-            if (RUN_LABELS)
-                set_tests_properties(${name} PROPERTIES LABELS "${RUN_LABELS}")
+            if (labels)
+                set_tests_properties(${name} PROPERTIES LABELS "${labels}")
             endif()
-            if (${RUN_FAIL})
+            if (${fail})
                 set_tests_properties(${name} PROPERTIES WILL_FAIL TRUE)
             endif()
         elseif(KIND STREQUAL "cpython")
             # CPython test
-            if (RUN_EXTRAFILES)
+            if (extra_files)
                 set(PY_MOD "${name}_mod")
-                add_library(${PY_MOD} SHARED ${RUN_EXTRAFILES})
+                add_library(${PY_MOD} SHARED ${extra_files})
                 set_target_properties(${PY_MOD} PROPERTIES LINKER_LANGUAGE C)
             else()
                 set(PY_MOD "")
             endif()
 
-            add_test(${name} python ${CMAKE_CURRENT_SOURCE_DIR}/${name}.py)
+            add_test(${name} python ${CMAKE_CURRENT_SOURCE_DIR}/${file_name}.py)
             set_tests_properties(${name} PROPERTIES
                 ENVIRONMENT "PYTHONPATH=${CMAKE_SOURCE_DIR}/../src/runtime/lpython:${CMAKE_SOURCE_DIR}/..;LPYTHON_PY_MOD_NAME=${PY_MOD};LPYTHON_PY_MOD_PATH=${CMAKE_CURRENT_BINARY_DIR}")
-            if (RUN_LABELS)
-                set_tests_properties(${name} PROPERTIES LABELS "${RUN_LABELS}")
+            if (labels)
+                set_tests_properties(${name} PROPERTIES LABELS "${labels}")
             endif()
-            if (${RUN_FAIL})
+            if (${fail})
                 set_tests_properties(${name} PROPERTIES WILL_FAIL TRUE)
             endif()
         elseif(KIND STREQUAL "x86")
             # x86 test
             add_custom_command(
                 OUTPUT ${name}.x86
-                COMMAND ${LPYTHON} --backend x86 ${CMAKE_CURRENT_SOURCE_DIR}/${name}.py -o ${name}.x86
-                DEPENDS ${CMAKE_CURRENT_SOURCE_DIR}/${name}.py
+                COMMAND ${LPYTHON} ${extra_args} --backend x86 ${CMAKE_CURRENT_SOURCE_DIR}/${file_name}.py -o ${name}.x86
+                DEPENDS ${CMAKE_CURRENT_SOURCE_DIR}/${file_name}.py
                 VERBATIM
             )
             add_custom_target(${name} ALL
             DEPENDS ${CMAKE_CURRENT_BINARY_DIR}/${name}.x86)
             add_test(${name} ${CMAKE_CURRENT_BINARY_DIR}/${name}.x86)
-            if (RUN_LABELS)
-                set_tests_properties(${name} PROPERTIES LABELS "${RUN_LABELS}")
+            if (labels)
+                set_tests_properties(${name} PROPERTIES LABELS "${labels}")
             endif()
-            if (${RUN_FAIL})
+            if (${fail})
                 set_tests_properties(${name} PROPERTIES WILL_FAIL TRUE)
             endif()
         elseif(KIND STREQUAL "wasm_x86")
             # wasm_to_x86 test
             add_custom_command(
                 OUTPUT ${name}.x86
-                COMMAND ${LPYTHON} --backend wasm_x86 ${CMAKE_CURRENT_SOURCE_DIR}/${name}.py -o ${name}.x86
-                DEPENDS ${CMAKE_CURRENT_SOURCE_DIR}/${name}.py
+                COMMAND ${LPYTHON} ${extra_args} --backend wasm_x86 ${CMAKE_CURRENT_SOURCE_DIR}/${file_name}.py -o ${name}.x86
+                DEPENDS ${CMAKE_CURRENT_SOURCE_DIR}/${file_name}.py
                 VERBATIM
             )
             add_custom_target(${name} ALL
             DEPENDS ${CMAKE_CURRENT_BINARY_DIR}/${name}.x86)
             add_test(${name} ${CMAKE_CURRENT_BINARY_DIR}/${name}.x86)
-            if (RUN_LABELS)
-                set_tests_properties(${name} PROPERTIES LABELS "${RUN_LABELS}")
+            if (labels)
+                set_tests_properties(${name} PROPERTIES LABELS "${labels}")
             endif()
-            if (${RUN_FAIL})
+            if (${fail})
                 set_tests_properties(${name} PROPERTIES WILL_FAIL TRUE)
             endif()
         elseif(KIND STREQUAL "wasm_x64")
             # wasm_to_x64 test
             add_custom_command(
                 OUTPUT ${name}.x64
-                COMMAND ${LPYTHON} --backend wasm_x64 ${CMAKE_CURRENT_SOURCE_DIR}/${name}.py -o ${name}.x64
-                DEPENDS ${CMAKE_CURRENT_SOURCE_DIR}/${name}.py
+                COMMAND ${LPYTHON} ${extra_args} --backend wasm_x64 ${CMAKE_CURRENT_SOURCE_DIR}/${file_name}.py -o ${name}.x64
+                DEPENDS ${CMAKE_CURRENT_SOURCE_DIR}/${file_name}.py
                 VERBATIM
             )
             add_custom_target(${name} ALL
             DEPENDS ${CMAKE_CURRENT_BINARY_DIR}/${name}.x64)
             add_test(${name} ${CMAKE_CURRENT_BINARY_DIR}/${name}.x64)
-            if (RUN_LABELS)
-                set_tests_properties(${name} PROPERTIES LABELS "${RUN_LABELS}")
+            if (labels)
+                set_tests_properties(${name} PROPERTIES LABELS "${labels}")
             endif()
-            if (${RUN_FAIL})
+            if (${fail})
                 set_tests_properties(${name} PROPERTIES WILL_FAIL TRUE)
             endif()
         elseif(KIND STREQUAL "wasm")
             # wasm test
-            execute_process(COMMAND ${LPYTHON} --backend wasm ${CMAKE_CURRENT_SOURCE_DIR}/${name}.py -o ${name})
+            execute_process(COMMAND ${LPYTHON} ${extra_args} --backend wasm ${CMAKE_CURRENT_SOURCE_DIR}/${file_name}.py -o ${name})
 
             find_program(WASM_EXEC_RUNTIME node)
             execute_process(COMMAND "${WASM_EXEC_RUNTIME}" --version
@@ -226,14 +222,38 @@ macro(RUN)
             endif()
             set(WASM_EXEC_FLAGS ${WASM_EXEC_FLAGS} "--experimental-wasi-unstable-preview1")
             add_test(${name} ${WASM_EXEC_RUNTIME} ${WASM_EXEC_FLAGS} ${CMAKE_CURRENT_BINARY_DIR}/${name}.js)
-            if (RUN_LABELS)
-                set_tests_properties(${name} PROPERTIES LABELS "${RUN_LABELS}")
+            if (labels)
+                set_tests_properties(${name} PROPERTIES LABELS "${labels}")
             endif()
-            if (${RUN_FAIL})
+            if (${fail})
                 set_tests_properties(${name} PROPERTIES WILL_FAIL TRUE)
             endif()
         endif()
     endif()
+endmacro(RUN_UTIL)
+
+macro(RUN)
+    set(options FAIL NOFAST ENABLE_CPYTHON)
+    set(oneValueArgs NAME IMPORT_PATH)
+    set(multiValueArgs LABELS EXTRAFILES)
+    cmake_parse_arguments(RUN "${options}" "${oneValueArgs}"
+                        "${multiValueArgs}" ${ARGN} )
+
+    set(RUN_EXTRA_ARGS "")
+    set(RUN_FILE_NAME ${RUN_NAME})
+
+    if (RUN_ENABLE_CPYTHON)
+        set(RUN_EXTRA_ARGS ${RUN_EXTRA_ARGS} --enable-cpython)
+    endif()
+
+    RUN_UTIL(RUN_FAIL RUN_NAME RUN_FILE_NAME RUN_IMPORT_PATH RUN_LABELS RUN_ENABLE_CPYTHON RUN_EXTRAFILES RUN_EXTRA_ARGS)
+
+    if (NOT RUN_NOFAST)
+        set(RUN_EXTRA_ARGS ${RUN_EXTRA_ARGS} --fast)
+        set(RUN_NAME "${RUN_NAME}_FAST")
+        list(REMOVE_ITEM RUN_LABELS cpython) # remove cpython from --fast test
+        RUN_UTIL(RUN_FAIL RUN_NAME RUN_FILE_NAME RUN_IMPORT_PATH RUN_LABELS RUN_ENABLE_CPYTHON RUN_EXTRAFILES RUN_EXTRA_ARGS)
+    endif()
 endmacro(RUN)
 
 # only compiles till object file
@@ -311,7 +331,7 @@ RUN(NAME variable_decl_01         LABELS cpython llvm c)
 RUN(NAME variable_decl_02         LABELS cpython llvm c)
 RUN(NAME variable_decl_03         LABELS cpython llvm c)
 RUN(NAME array_expr_01            LABELS cpython llvm c)
-RUN(NAME array_expr_02            LABELS cpython llvm c)
+RUN(NAME array_expr_02            LABELS cpython llvm c NOFAST)
 RUN(NAME array_size_01            LABELS cpython llvm c)
 RUN(NAME array_size_02            LABELS cpython llvm c)
 RUN(NAME array_01            LABELS cpython llvm wasm c)
@@ -319,12 +339,12 @@ RUN(NAME array_02            LABELS cpython wasm c)
 RUN(NAME array_03            LABELS cpython llvm c)
 RUN(NAME bindc_01            LABELS cpython llvm c)
 RUN(NAME bindc_02            LABELS cpython llvm c)
-RUN(NAME bindc_04            LABELS llvm c)
-RUN(NAME bindc_07            LABELS cpython llvm c)
+RUN(NAME bindc_04            LABELS llvm c NOFAST)
+RUN(NAME bindc_07            LABELS cpython llvm c NOFAST)
 RUN(NAME bindc_08            LABELS cpython llvm c)
 RUN(NAME bindc_09            LABELS cpython llvm c)
-RUN(NAME exit_01             LABELS cpython llvm c)
-RUN(NAME exit_02     FAIL    LABELS cpython llvm c)
+RUN(NAME exit_01             LABELS cpython llvm c NOFAST)
+RUN(NAME exit_02     FAIL    LABELS cpython llvm c NOFAST)
 RUN(NAME exit_03             LABELS cpython llvm c wasm wasm_x86 wasm_x64)
 RUN(NAME exit_04     FAIL    LABELS cpython llvm c wasm wasm_x86 wasm_x64)
 RUN(NAME exit_01b            LABELS cpython llvm c wasm wasm_x86 wasm_x64)
@@ -338,8 +358,8 @@ RUN(NAME print_04            LABELS cpython llvm c)
 RUN(NAME print_06            LABELS cpython llvm c)
 RUN(NAME print_05            LABELS cpython llvm c wasm wasm_x64)
 RUN(NAME print_float         LABELS cpython llvm c wasm wasm_x64)
-RUN(NAME print_list_tuple_01    LABELS cpython llvm c)
-RUN(NAME print_list_tuple_02    LABELS cpython llvm c)
+RUN(NAME print_list_tuple_01    LABELS cpython llvm c NOFAST)
+RUN(NAME print_list_tuple_02    LABELS cpython llvm c NOFAST)
 
 # CPython and LLVM
 RUN(NAME const_01            LABELS cpython llvm c)
@@ -350,24 +370,24 @@ RUN(NAME const_04            LABELS cpython llvm c)
 RUN(NAME expr_01             LABELS cpython llvm c wasm wasm_x64)
 RUN(NAME expr_02             LABELS cpython llvm c wasm wasm_x64)
 RUN(NAME expr_03             LABELS cpython llvm c wasm wasm_x64)
-RUN(NAME expr_04             LABELS cpython llvm c wasm)
-RUN(NAME expr_05             LABELS cpython llvm c)
-RUN(NAME expr_06             LABELS cpython llvm c)
+RUN(NAME expr_04             LABELS cpython llvm c wasm NOFAST)
+RUN(NAME expr_05             LABELS cpython llvm c NOFAST)
+RUN(NAME expr_06             LABELS cpython llvm c NOFAST)
 RUN(NAME expr_07             LABELS cpython llvm c)
-RUN(NAME expr_08             LABELS llvm c)
+RUN(NAME expr_08             LABELS llvm c NOFAST)
 RUN(NAME expr_09             LABELS cpython llvm c)
 RUN(NAME expr_10             LABELS cpython llvm c)
 RUN(NAME expr_11             LABELS cpython llvm c wasm)
 RUN(NAME expr_12             LABELS llvm c)
 RUN(NAME expr_13             LABELS llvm c
-        EXTRAFILES expr_13b.c)
+        EXTRAFILES expr_13b.c NOFAST)
 RUN(NAME expr_14             LABELS cpython llvm c)
 RUN(NAME expr_15             LABELS cpython llvm c)
 RUN(NAME expr_16             LABELS cpython c)
 
-RUN(NAME expr_01u            LABELS cpython llvm c)
-RUN(NAME expr_02u            LABELS cpython llvm c)
-RUN(NAME expr_03u            LABELS cpython llvm c)
+RUN(NAME expr_01u            LABELS cpython llvm c NOFAST)
+RUN(NAME expr_02u            LABELS cpython llvm c NOFAST)
+RUN(NAME expr_03u            LABELS cpython llvm c NOFAST)
 
 RUN(NAME loop_01             LABELS cpython llvm c)
 RUN(NAME loop_02             LABELS cpython llvm c wasm wasm_x86 wasm_x64)
@@ -376,7 +396,7 @@ RUN(NAME loop_04             LABELS cpython llvm c)
 RUN(NAME loop_05             LABELS cpython llvm c)
 RUN(NAME if_01               LABELS cpython llvm c wasm wasm_x86 wasm_x64)
 RUN(NAME if_02               LABELS cpython llvm c wasm wasm_x86 wasm_x64)
-RUN(NAME if_03    FAIL       LABELS cpython llvm c)
+RUN(NAME if_03    FAIL       LABELS cpython llvm c NOFAST)
 RUN(NAME print_02            LABELS cpython llvm c)
 RUN(NAME test_types_01       LABELS cpython llvm c)
 RUN(NAME test_types_02       LABELS cpython llvm c wasm)
@@ -385,27 +405,27 @@ RUN(NAME test_str_02         LABELS cpython llvm c)
 RUN(NAME test_str_03         LABELS cpython llvm c)
 RUN(NAME test_list_01        LABELS cpython llvm c)
 RUN(NAME test_list_02        LABELS cpython llvm c)
-RUN(NAME test_list_03        LABELS cpython llvm c)
-RUN(NAME test_list_04        LABELS cpython llvm c)
-RUN(NAME test_list_05        LABELS cpython llvm c)
+RUN(NAME test_list_03        LABELS cpython llvm c NOFAST)
+RUN(NAME test_list_04        LABELS cpython llvm c NOFAST)
+RUN(NAME test_list_05        LABELS cpython llvm c NOFAST)
 RUN(NAME test_list_06        LABELS cpython llvm c)
-RUN(NAME test_list_07        LABELS cpython llvm c)
-RUN(NAME test_list_08        LABELS cpython llvm c)
-RUN(NAME test_list_09        LABELS cpython llvm c)
-RUN(NAME test_list_10        LABELS cpython llvm c)
+RUN(NAME test_list_07        LABELS cpython llvm c NOFAST)
+RUN(NAME test_list_08        LABELS cpython llvm c NOFAST)
+RUN(NAME test_list_09        LABELS cpython llvm c NOFAST)
+RUN(NAME test_list_10        LABELS cpython llvm c NOFAST)
 RUN(NAME test_list_11        LABELS cpython llvm c)
-RUN(NAME test_list_section   LABELS cpython llvm c)
+RUN(NAME test_list_section   LABELS cpython llvm c NOFAST)
 RUN(NAME test_list_count     LABELS cpython llvm)
 RUN(NAME test_list_index     LABELS cpython llvm)
 RUN(NAME test_list_reverse   LABELS cpython llvm)
 RUN(NAME test_tuple_01       LABELS cpython llvm c)
-RUN(NAME test_tuple_02       LABELS cpython llvm c)
+RUN(NAME test_tuple_02       LABELS cpython llvm c NOFAST)
 RUN(NAME test_tuple_03       LABELS cpython llvm c)
 RUN(NAME test_tuple_concat   LABELS cpython llvm)
 RUN(NAME test_dict_01        LABELS cpython llvm c)
-RUN(NAME test_dict_02        LABELS cpython llvm c)
-RUN(NAME test_dict_03        LABELS cpython llvm)
-RUN(NAME test_dict_04        LABELS cpython llvm)
+RUN(NAME test_dict_02        LABELS cpython llvm c NOFAST)
+RUN(NAME test_dict_03        LABELS cpython llvm NOFAST)
+RUN(NAME test_dict_04        LABELS cpython llvm NOFAST)
 RUN(NAME test_dict_05        LABELS cpython llvm c)
 RUN(NAME test_dict_06        LABELS cpython llvm c)
 RUN(NAME test_dict_07        LABELS cpython llvm c)
@@ -423,25 +443,25 @@ RUN(NAME test_import_03      LABELS cpython llvm c)
 RUN(NAME test_import_04      IMPORT_PATH ..
         LABELS cpython llvm c)
 RUN(NAME test_import_05      LABELS cpython llvm c wasm wasm_x86 wasm_x64)
-RUN(NAME test_math           LABELS cpython llvm)
+RUN(NAME test_math           LABELS cpython llvm NOFAST)
 RUN(NAME test_numpy_01       LABELS cpython llvm c)
 RUN(NAME test_numpy_02       LABELS cpython llvm c)
 RUN(NAME test_numpy_03       LABELS cpython llvm c)
 RUN(NAME test_numpy_04       LABELS cpython llvm c)
-RUN(NAME elemental_01        LABELS cpython llvm c)
-RUN(NAME elemental_02        LABELS cpython llvm c)
-RUN(NAME elemental_03        LABELS cpython llvm c)
-RUN(NAME elemental_04        LABELS cpython llvm c)
-RUN(NAME elemental_05        LABELS cpython llvm c)
-RUN(NAME elemental_06        LABELS cpython llvm c)
-RUN(NAME elemental_07        LABELS cpython llvm c)
-RUN(NAME elemental_08        LABELS cpython llvm c)
-RUN(NAME elemental_09        LABELS cpython llvm c)
-RUN(NAME elemental_10        LABELS cpython llvm c)
-RUN(NAME elemental_11        LABELS cpython llvm c)
-RUN(NAME elemental_12        LABELS cpython llvm c)
-RUN(NAME test_random         LABELS cpython llvm)
-RUN(NAME test_os             LABELS cpython llvm c)
+RUN(NAME elemental_01        LABELS cpython llvm c NOFAST)
+RUN(NAME elemental_02        LABELS cpython llvm c NOFAST)
+RUN(NAME elemental_03        LABELS cpython llvm c NOFAST)
+RUN(NAME elemental_04        LABELS cpython llvm c NOFAST)
+RUN(NAME elemental_05        LABELS cpython llvm c NOFAST)
+RUN(NAME elemental_06        LABELS cpython llvm c NOFAST)
+RUN(NAME elemental_07        LABELS cpython llvm c NOFAST)
+RUN(NAME elemental_08        LABELS cpython llvm c NOFAST)
+RUN(NAME elemental_09        LABELS cpython llvm c NOFAST)
+RUN(NAME elemental_10        LABELS cpython llvm c NOFAST)
+RUN(NAME elemental_11        LABELS cpython llvm c NOFAST)
+RUN(NAME elemental_12        LABELS cpython llvm c NOFAST)
+RUN(NAME test_random         LABELS cpython llvm NOFAST)
+RUN(NAME test_os             LABELS cpython llvm c NOFAST)
 RUN(NAME test_builtin        LABELS cpython llvm c)
 RUN(NAME test_builtin_abs    LABELS cpython llvm c)
 RUN(NAME test_builtin_bool   LABELS cpython llvm c)
@@ -453,12 +473,12 @@ RUN(NAME test_builtin_oct    LABELS cpython llvm c)
 RUN(NAME test_builtin_hex    LABELS cpython llvm c)
 RUN(NAME test_builtin_bin    LABELS cpython llvm c)
 RUN(NAME test_builtin_float  LABELS cpython llvm c)
-RUN(NAME test_builtin_str_02 LABELS cpython llvm c)
+RUN(NAME test_builtin_str_02 LABELS cpython llvm c NOFAST)
 RUN(NAME test_builtin_round  LABELS cpython llvm c)
 RUN(NAME test_builtin_divmod LABELS cpython llvm c)
 RUN(NAME test_builtin_sum    LABELS cpython llvm c)
 RUN(NAME test_math1          LABELS cpython llvm c)
-RUN(NAME test_math_02        LABELS cpython llvm)
+RUN(NAME test_math_02        LABELS cpython llvm NOFAST)
 RUN(NAME test_math_03        LABELS llvm)               #1595: TODO: Test using CPython (3.11 recommended)
 RUN(NAME test_pass_compare   LABELS cpython llvm c)
 RUN(NAME test_c_interop_01   LABELS cpython llvm c)
@@ -476,9 +496,9 @@ RUN(NAME bindc_05   LABELS llvm c
         EXTRAFILES bindc_05b.c)
 RUN(NAME bindc_06   LABELS llvm c
         EXTRAFILES bindc_06b.c)
-RUN(NAME bindpy_01           LABELS cpython c ENABLE_CPYTHON EXTRAFILES bindpy_01_module.py)
-RUN(NAME test_generics_01    LABELS cpython llvm c)
-RUN(NAME test_cmath          LABELS cpython llvm c)
+RUN(NAME bindpy_01           LABELS cpython c ENABLE_CPYTHON NOFAST EXTRAFILES bindpy_01_module.py)
+RUN(NAME test_generics_01    LABELS cpython llvm c NOFAST)
+RUN(NAME test_cmath          LABELS cpython llvm c NOFAST)
 RUN(NAME test_complex_01        LABELS cpython llvm c wasm wasm_x64)
 RUN(NAME test_complex_02        LABELS cpython llvm c)
 RUN(NAME test_max_min        LABELS cpython llvm c)
@@ -489,7 +509,7 @@ RUN(NAME test_ifexp          LABELS cpython llvm c)
 RUN(NAME test_unary_minus    LABELS cpython llvm c)
 RUN(NAME test_unary_plus     LABELS cpython llvm c)
 RUN(NAME test_bool_binop     LABELS cpython llvm c)
-RUN(NAME test_issue_518      LABELS cpython llvm c)
+RUN(NAME test_issue_518      LABELS cpython llvm c NOFAST)
 RUN(NAME structs_01          LABELS cpython llvm c)
 RUN(NAME structs_02          LABELS cpython llvm c)
 RUN(NAME structs_03          LABELS llvm c)
@@ -500,7 +520,7 @@ RUN(NAME structs_07          LABELS llvm c
         EXTRAFILES structs_07b.c)
 RUN(NAME structs_08          LABELS cpython llvm c)
 RUN(NAME structs_09          LABELS cpython llvm c)
-RUN(NAME structs_10          LABELS cpython llvm c)
+RUN(NAME structs_10          LABELS cpython llvm c NOFAST)
 RUN(NAME structs_11          LABELS cpython llvm c)
 RUN(NAME structs_12          LABELS cpython llvm c)
 RUN(NAME structs_13          LABELS llvm c
@@ -516,8 +536,8 @@ RUN(NAME structs_19          LABELS cpython llvm c
 RUN(NAME structs_20          LABELS cpython llvm c
     EXTRAFILES structs_20b.c)
 RUN(NAME structs_21          LABELS cpython llvm c)
-RUN(NAME structs_22          LABELS cpython llvm c)
-RUN(NAME structs_23          LABELS cpython llvm c)
+RUN(NAME structs_22          LABELS cpython llvm c NOFAST)
+RUN(NAME structs_23          LABELS cpython llvm c NOFAST)
 RUN(NAME structs_24          LABELS cpython llvm c)
 RUN(NAME structs_25          LABELS cpython llvm c)
 RUN(NAME sizeof_01           LABELS llvm c
@@ -540,18 +560,18 @@ RUN(NAME test_platform       LABELS cpython llvm c)
 RUN(NAME test_vars_01        LABELS cpython llvm)
 RUN(NAME test_version        LABELS cpython llvm)
 RUN(NAME logical_binop1      LABELS cpython llvm)
-RUN(NAME vec_01              LABELS cpython llvm c)
+RUN(NAME vec_01              LABELS cpython llvm c NOFAST)
 RUN(NAME test_str_comparison LABELS cpython llvm c)
 RUN(NAME test_bit_length     LABELS cpython llvm c)
 RUN(NAME str_to_list_cast    LABELS cpython llvm c)
-RUN(NAME test_sys_01         LABELS cpython llvm c)
+RUN(NAME test_sys_01         LABELS cpython llvm c NOFAST)
 RUN(NAME intent_01           LABELS cpython llvm)
 
 
-RUN(NAME test_package_01     LABELS cpython llvm)
+RUN(NAME test_package_01     LABELS cpython llvm NOFAST)
 RUN(NAME test_pkg_lpdraw     LABELS cpython llvm wasm)
-RUN(NAME test_pkg_lnn_01        LABELS cpython llvm)
-RUN(NAME test_pkg_lnn_02        LABELS cpython llvm)
+RUN(NAME test_pkg_lnn_01        LABELS cpython llvm NOFAST)
+RUN(NAME test_pkg_lnn_02        LABELS cpython llvm NOFAST)
 RUN(NAME test_pkg_lpconvexhull  LABELS cpython c)
 
 RUN(NAME generics_01         LABELS cpython llvm c)
@@ -560,9 +580,9 @@ RUN(NAME generics_array_01   LABELS cpython llvm c)
 RUN(NAME generics_array_02   LABELS cpython llvm c)
 RUN(NAME generics_array_03   LABELS cpython llvm c)
 RUN(NAME generics_list_01    LABELS cpython llvm c)
-RUN(NAME test_statistics     LABELS cpython llvm)
+RUN(NAME test_statistics     LABELS cpython llvm NOFAST)
 RUN(NAME test_str_attributes LABELS cpython llvm c)
-RUN(NAME kwargs_01           LABELS cpython llvm c)
+RUN(NAME kwargs_01           LABELS cpython llvm c NOFAST)
 
 RUN(NAME func_inline_01 LABELS llvm c wasm)
 RUN(NAME func_inline_02 LABELS cpython llvm c)
@@ -577,7 +597,7 @@ RUN(NAME comp_01 LABELS cpython llvm c wasm wasm_x64)
 RUN(NAME bit_operations_i32 LABELS cpython llvm c wasm wasm_x64)
 RUN(NAME bit_operations_i64 LABELS cpython llvm c wasm)
 
-RUN(NAME test_argv_01      LABELS cpython llvm)
+RUN(NAME test_argv_01      LABELS cpython llvm NOFAST)
 RUN(NAME global_syms_01    LABELS cpython llvm c)
 RUN(NAME global_syms_02    LABELS cpython llvm c)
 RUN(NAME global_syms_03_b  LABELS cpython llvm c)
@@ -589,7 +609,7 @@ RUN(NAME global_syms_06    LABELS cpython llvm c)
 RUN(NAME callback_01       LABELS cpython llvm)
 
 # Intrinsic Functions
-RUN(NAME intrinsics_01     LABELS cpython llvm) # any
+RUN(NAME intrinsics_01     LABELS cpython llvm NOFAST) # any
 
 # lpython decorator
 RUN(NAME lpython_decorator_01    LABELS cpython)