diff --git a/tests/performance/decimal_casts.xml b/tests/performance/decimal_casts.xml
index 2ff5e9dcdd6..e15cfe8c492 100644
--- a/tests/performance/decimal_casts.xml
+++ b/tests/performance/decimal_casts.xml
@@ -1,11 +1,11 @@
-<test>
+<test max_ignored_relative_change="0.15">
     <settings>
         <max_memory_usage>10G</max_memory_usage>
     </settings>
 
     <create_query>CREATE TABLE t (x UInt64, d32 Decimal32(3), d64 Decimal64(4), d128 Decimal128(5)) ENGINE = Memory</create_query>
     <!-- use less threads to save memory -->
-    <fill_query>INSERT INTO t SELECT number AS x, x % 1000000 AS d32, x AS d64, x d128 FROM numbers_mt(50000000) SETTINGS max_threads = 8</fill_query>
+    <fill_query>INSERT INTO t SELECT number AS x, x % 1000000 AS d32, x AS d64, x d128 FROM numbers_mt(25000000) SETTINGS max_threads = 8</fill_query>
     <drop_query>DROP TABLE IF EXISTS t</drop_query>
 
     <query>SELECT toUInt32(x) y, toDecimal32(y, 1), toDecimal64(y, 5), toDecimal128(y, 6), toDecimal256(y, 7) FROM t FORMAT Null</query>