diff --git a/ddl/concurrentddltest/BUILD.bazel b/ddl/concurrentddltest/BUILD.bazel
index 82e2adf1fe9c2..61388f159390f 100644
--- a/ddl/concurrentddltest/BUILD.bazel
+++ b/ddl/concurrentddltest/BUILD.bazel
@@ -2,7 +2,7 @@ load("@io_bazel_rules_go//go:def.bzl", "go_test")
 
 go_test(
     name = "concurrentddltest_test",
-    timeout = "moderate",
+    timeout = "long",
     srcs = [
         "main_test.go",
         "switch_test.go",
diff --git a/executor/BUILD.bazel b/executor/BUILD.bazel
index 7b1a4d603f993..0e2fbacf20f95 100644
--- a/executor/BUILD.bazel
+++ b/executor/BUILD.bazel
@@ -247,7 +247,7 @@ go_library(
 
 go_test(
     name = "executor_test",
-    timeout = "moderate",
+    timeout = "long",
     srcs = [
         "adapter_test.go",
         "admin_test.go",
diff --git a/session/BUILD.bazel b/session/BUILD.bazel
index d0d68a9142035..be3c8699ee6c8 100644
--- a/session/BUILD.bazel
+++ b/session/BUILD.bazel
@@ -107,7 +107,7 @@ go_library(
 
 go_test(
     name = "session_test",
-    timeout = "short",
+    timeout = "moderate",
     srcs = [
         "bench_test.go",
         "bootstrap_test.go",
diff --git a/testkit/BUILD.bazel b/testkit/BUILD.bazel
index 39cedb2ce0b53..4e0e24091db27 100644
--- a/testkit/BUILD.bazel
+++ b/testkit/BUILD.bazel
@@ -30,6 +30,7 @@ go_library(
         "//util/breakpoint",
         "//util/chunk",
         "//util/gctuner",
+        "//util/mathutil",
         "//util/sqlexec",
         "@com_github_pingcap_errors//:errors",
         "@com_github_pingcap_failpoint//:failpoint",
diff --git a/testkit/testkit.go b/testkit/testkit.go
index db86548ee3bfd..56e02fef5e688 100644
--- a/testkit/testkit.go
+++ b/testkit/testkit.go
@@ -19,6 +19,7 @@ package testkit
 import (
 	"context"
 	"fmt"
+	"runtime"
 	"strings"
 	"sync"
 	"testing"
@@ -32,6 +33,7 @@ import (
 	"github.com/pingcap/tidb/session"
 	"github.com/pingcap/tidb/sessionctx/variable"
 	"github.com/pingcap/tidb/util/chunk"
+	"github.com/pingcap/tidb/util/mathutil"
 	"github.com/pingcap/tidb/util/sqlexec"
 	"github.com/stretchr/testify/assert"
 	"github.com/stretchr/testify/require"
@@ -54,6 +56,7 @@ type TestKit struct {
 
 // NewTestKit returns a new *TestKit.
 func NewTestKit(t testing.TB, store kv.Storage) *TestKit {
+	runtime.GOMAXPROCS(mathutil.Min(16, runtime.GOMAXPROCS(0)))
 	tk := &TestKit{
 		require: require.New(t),
 		assert:  assert.New(t),