diff --git a/test/core.pkb b/test/core.pkb
index 69a21b69e..7ace9f7ce 100644
--- a/test/core.pkb
+++ b/test/core.pkb
@@ -3,6 +3,9 @@ create or replace package body core is
   procedure global_setup is
   begin
     ut3.ut_coverage.set_develop_mode(true);
+    --improve performance of test execution by disabling all compiler optimizations
+    execute_autonomous('ALTER SESSION SET PLSQL_OPTIMIZE_LEVEL=0');
+
     execute_autonomous(
       q'[create or replace package ut_transaction_control as
             function count_rows(a_val varchar2) return number;