speedup ssl_transport_security_test also on Mac
diff --git a/test/core/tsi/ssl_transport_security_test.cc b/test/core/tsi/ssl_transport_security_test.cc
index 3f63df3..70b8355 100644
--- a/test/core/tsi/ssl_transport_security_test.cc
+++ b/test/core/tsi/ssl_transport_security_test.cc
@@ -659,12 +659,14 @@
void ssl_tsi_test_do_round_trip_odd_buffer_size() {
gpr_log(GPR_INFO, "ssl_tsi_test_do_round_trip_odd_buffer_size");
-#if !defined(MEMORY_SANITIZER) && !defined(GPR_ARCH_32)
+#if !defined(MEMORY_SANITIZER) && !defined(GPR_ARCH_32) && !defined(__APPLE__)
const size_t odd_sizes[] = {1025, 2051, 4103, 8207, 16409};
#else
// 1. avoid test being extremely slow under MSAN
// 2. on 32-bit, the test is much slower (probably due to lack of boringssl
// asm optimizations) so we only run a subset of tests to avoid timeout
+ // 3. on Mac OS, we have slower testing machines so we only run a subset
+ // of tests to avoid timeout
const size_t odd_sizes[] = {1025};
#endif
const size_t size = sizeof(odd_sizes) / sizeof(size_t);
