diff --git a/sdc/tests/tests_perf/test_perf_series_str.py b/sdc/tests/tests_perf/test_perf_series_str.py
index 449b9f250..2a25ce8e2 100644
--- a/sdc/tests/tests_perf/test_perf_series_str.py
+++ b/sdc/tests/tests_perf/test_perf_series_str.py
@@ -80,6 +80,15 @@ def _test_case(self, pyfunc, name, total_data_length, data_num=1, input_data=tes
     TC(name='center', params='1', size=[10 ** 4, 10 ** 5],  input_data=test_global_input_data_unicode_kind1),
     TC(name='endswith', params='"e"', size=[10 ** 4, 10 ** 5]),
     TC(name='find', params='"e"', size=[10 ** 4, 10 ** 5]),
+    TC(name='isalnum', size=[10 ** 4, 10 ** 5]),
+    TC(name='isalpha', size=[10 ** 4, 10 ** 5]),
+    TC(name='isdecimal', size=[10 ** 4, 10 ** 5]),
+    TC(name='isdigit', size=[10 ** 4, 10 ** 5]),
+    TC(name='islower', size=[10 ** 4, 10 ** 5]),
+    TC(name='isnumeric', size=[10 ** 4, 10 ** 5]),
+    TC(name='isspace', size=[10 ** 4, 10 ** 5]),
+    TC(name='istitle', size=[10 ** 4, 10 ** 5]),
+    TC(name='isupper', size=[10 ** 4, 10 ** 5]),
     TC(name='len', size=[10 ** 4, 10 ** 5]),
     TC(name='ljust', params='1', size=[10 ** 4, 10 ** 5], input_data=test_global_input_data_unicode_kind1),
     TC(name='lower', size=[10 ** 4, 10 ** 5]),