diff --git a/test/core/gpr/mpscq_test.cc b/test/core/gpr/mpscq_test.cc
index 33f93878e01..1e929fcf337 100644
--- a/test/core/gpr/mpscq_test.cc
+++ b/test/core/gpr/mpscq_test.cc
@@ -146,8 +146,8 @@ static void test_mt_multipop(void) {
   gpr_log(GPR_DEBUG, "test_mt_multipop");
   gpr_event start;
   gpr_event_init(&start);
-  grpc_core::Thread thds[100];
-  grpc_core::Thread pull_thds[100];
+  grpc_core::Thread thds[50];
+  grpc_core::Thread pull_thds[50];
   thd_args ta[GPR_ARRAY_SIZE(thds)];
   gpr_mpscq q;
   gpr_mpscq_init(&q);
diff --git a/test/core/gprpp/thd_test.cc b/test/core/gprpp/thd_test.cc
index 1aa8632757f..a126784e724 100644
--- a/test/core/gprpp/thd_test.cc
+++ b/test/core/gprpp/thd_test.cc
@@ -30,7 +30,7 @@
 
 #include "test/core/util/test_config.h"
 
-#define NUM_THREADS 300
+#define NUM_THREADS 100
 
 struct test {
   gpr_mu mu;