diff --git a/pkg/sessionctx/variable/session_test.go b/pkg/sessionctx/variable/session_test.go
index dcb732076e09b..6525af2f15462 100644
--- a/pkg/sessionctx/variable/session_test.go
+++ b/pkg/sessionctx/variable/session_test.go
@@ -289,6 +289,10 @@ func TestSlowLogFormat(t *testing.T) {
 	sql := "select * from t;"
 	_, digest := parser.NormalizeDigest(sql)
 	ruDetails := util.NewRUDetailsWith(50.0, 100.56, 134*time.Millisecond)
+	seVar.DurationParse = 10
+	seVar.DurationCompile = 10
+	seVar.DurationOptimization = 10
+	seVar.DurationWaitTS = 3
 	logItems := &variable.SlowQueryLogItems{
 		TxnTS:             txnTS,
 		KeyspaceName:      "keyspace_a",
@@ -296,10 +300,6 @@ func TestSlowLogFormat(t *testing.T) {
 		SQL:               sql,
 		Digest:            digest.String(),
 		TimeTotal:         costTime,
-		TimeParse:         time.Duration(10),
-		TimeCompile:       time.Duration(10),
-		TimeOptimize:      time.Duration(10),
-		TimeWaitTS:        time.Duration(3),
 		IndexNames:        "[t1:a,t2:b]",
 		CopTasks:          copTasks,
 		ExecDetail:        execDetail,
@@ -324,9 +324,7 @@ func TestSlowLogFormat(t *testing.T) {
 		IsWriteCacheTable: true,
 		UsedStats:         &stmtctx.UsedStatsInfo{},
 		ResourceGroupName: "rg1",
-		RRU:               ruDetails.RRU(),
-		WRU:               ruDetails.WRU(),
-		WaitRUDuration:    ruDetails.RUWaitDuration(),
+		RUDetails:         ruDetails,
 		StorageKV:         true,
 		StorageMPP:        false,
 	}
@@ -335,7 +333,6 @@ func TestSlowLogFormat(t *testing.T) {
 	seVar.CurrentDBChanged = false
 	logString := seVar.SlowLogFormat(logItems)
 	require.Equal(t, resultFields+"\n"+sql, logString)
-
 	seVar.CurrentDBChanged = true
 	logString = seVar.SlowLogFormat(logItems)
 	require.Equal(t, resultFields+"\n"+"use test;\n"+sql, logString)
@@ -392,8 +389,6 @@ func compareSlowLogItems(t *testing.T, expected, actual *variable.SlowQueryLogIt
 
 	// Some fields are hard to mock, so we skip them.
 	skipFields := []string{"KeyspaceID", "KeyspaceName", "TimeTotal", "Prepared", "ResultRows", "ResultRows", "Plan", "BinaryPlan",
-		"TimeParse", "TimeCompile", "TimeOptimize", "TimeWaitTS",
-		"RRU", "WRU", "WaitRUDuration",
 		"UsedStats", "CopTasks", "RewriteInfo", "ExecRetryTime", "Warnings", "RUDetails", "MemMax", "DiskMax", "StorageKV"}
 	skipFieldsFunc := func(res string, fields []string) bool {
 		for _, f := range fields {
diff --git a/pkg/sessionctx/variable/slow_log.go b/pkg/sessionctx/variable/slow_log.go
index 0c3a857ba7dbb..98ed77aacb64d 100644
--- a/pkg/sessionctx/variable/slow_log.go
+++ b/pkg/sessionctx/variable/slow_log.go
@@ -239,10 +239,6 @@ type SlowQueryLogItems struct {
 	SQL               string
 	Digest            string
 	TimeTotal         time.Duration
-	TimeParse         time.Duration
-	TimeCompile       time.Duration
-	TimeOptimize      time.Duration
-	TimeWaitTS        time.Duration
 	IndexNames        string
 	CopTasks          *execdetails.CopTasksDetails
 	ExecDetail        *execdetails.ExecDetails
@@ -270,9 +266,6 @@ type SlowQueryLogItems struct {
 	Warnings          []JSONSQLWarnForSlowLog
 	ResourceGroupName string
 	RUDetails         *util.RUDetails
-	RRU               float64
-	WRU               float64
-	WaitRUDuration    time.Duration
 	CPUUsages         ppcpuusage.CPUUsages
 	StorageKV         bool // query read from TiKV
 	StorageMPP        bool // query read from TiFlash
@@ -349,8 +342,8 @@ func (s *SessionVars) SlowLogFormat(logItems *SlowQueryLogItems) string {
 		buf.WriteString("\n")
 	}
 	writeSlowLogItem(&buf, SlowLogQueryTimeStr, strconv.FormatFloat(logItems.TimeTotal.Seconds(), 'f', -1, 64))
-	writeSlowLogItem(&buf, SlowLogParseTimeStr, strconv.FormatFloat(logItems.TimeParse.Seconds(), 'f', -1, 64))
-	writeSlowLogItem(&buf, SlowLogCompileTimeStr, strconv.FormatFloat(logItems.TimeCompile.Seconds(), 'f', -1, 64))
+	writeSlowLogItem(&buf, SlowLogParseTimeStr, strconv.FormatFloat(s.DurationParse.Seconds(), 'f', -1, 64))
+	writeSlowLogItem(&buf, SlowLogCompileTimeStr, strconv.FormatFloat(s.DurationCompile.Seconds(), 'f', -1, 64))
 
 	buf.WriteString(SlowLogRowPrefixStr + fmt.Sprintf("%v%v%v", SlowLogRewriteTimeStr,
 		SlowLogSpaceMarkStr, strconv.FormatFloat(logItems.RewriteInfo.DurationRewrite.Seconds(), 'f', -1, 64)))
@@ -360,8 +353,8 @@ func (s *SessionVars) SlowLogFormat(logItems *SlowQueryLogItems) string {
 	}
 	buf.WriteString("\n")
 
-	writeSlowLogItem(&buf, SlowLogOptimizeTimeStr, strconv.FormatFloat(logItems.TimeOptimize.Seconds(), 'f', -1, 64))
-	writeSlowLogItem(&buf, SlowLogWaitTSTimeStr, strconv.FormatFloat(logItems.TimeWaitTS.Seconds(), 'f', -1, 64))
+	writeSlowLogItem(&buf, SlowLogOptimizeTimeStr, strconv.FormatFloat(s.DurationOptimization.Seconds(), 'f', -1, 64))
+	writeSlowLogItem(&buf, SlowLogWaitTSTimeStr, strconv.FormatFloat(s.DurationWaitTS.Seconds(), 'f', -1, 64))
 
 	if logItems.ExecDetail != nil {
 		if execDetailStr := logItems.ExecDetail.String(); len(execDetailStr) > 0 {
@@ -491,29 +484,17 @@ func (s *SessionVars) SlowLogFormat(logItems *SlowQueryLogItems) string {
 	if logItems.ResourceGroupName != "" {
 		writeSlowLogItem(&buf, SlowLogResourceGroup, logItems.ResourceGroupName)
 	}
-	rru := logItems.RRU
-	wru := logItems.WRU
-	waitRUDuration := logItems.WaitRUDuration
 	if logItems.RUDetails != nil {
-		if rru == 0.0 {
-			rru = logItems.RUDetails.RRU()
+		if rru := logItems.RUDetails.RRU(); rru > 0.0 {
+			writeSlowLogItem(&buf, SlowLogRRU, strconv.FormatFloat(rru, 'f', -1, 64))
 		}
-		if wru == 0.0 {
-			wru = logItems.RUDetails.WRU()
+		if wru := logItems.RUDetails.WRU(); wru > 0.0 {
+			writeSlowLogItem(&buf, SlowLogWRU, strconv.FormatFloat(wru, 'f', -1, 64))
 		}
-		if waitRUDuration == 0 {
-			waitRUDuration = logItems.RUDetails.RUWaitDuration()
+		if waitRUDuration := logItems.RUDetails.RUWaitDuration(); waitRUDuration > 0 {
+			writeSlowLogItem(&buf, SlowLogWaitRUDuration, strconv.FormatFloat(waitRUDuration.Seconds(), 'f', -1, 64))
 		}
 	}
-	if rru > 0.0 {
-		writeSlowLogItem(&buf, SlowLogRRU, strconv.FormatFloat(rru, 'f', -1, 64))
-	}
-	if wru > 0.0 {
-		writeSlowLogItem(&buf, SlowLogWRU, strconv.FormatFloat(wru, 'f', -1, 64))
-	}
-	if waitRUDuration > 0 {
-		writeSlowLogItem(&buf, SlowLogWaitRUDuration, strconv.FormatFloat(waitRUDuration.Seconds(), 'f', -1, 64))
-	}
 	if logItems.CPUUsages.TidbCPUTime > time.Duration(0) {
 		writeSlowLogItem(&buf, SlowLogTidbCPUUsageDuration, strconv.FormatFloat(logItems.CPUUsages.TidbCPUTime.Seconds(), 'f', -1, 64))
 	}