chore: optimize stat calculation (#3213)

core/stat/metrics.go

@@ -141,7 +141,7 @@ func (c *metricsContainer) Execute(v any) {
 			report.Median = float32(medianTask.Duration) / float32(time.Millisecond)
 			tenPercent := fiftyPercent / 5
 			if tenPercent > 0 {
-				top10pTasks := topK(tasks, tenPercent)
+				top10pTasks := topK(top50pTasks, tenPercent)
 				task90th := top10pTasks[0]
 				report.Top90th = float32(task90th.Duration) / float32(time.Millisecond)
 				onePercent := tenPercent / 10
@@ -163,7 +163,7 @@ func (c *metricsContainer) Execute(v any) {
 					report.Top99p9th = mostDuration
 				}
 			} else {
-				mostDuration := getTopDuration(tasks)
+				mostDuration := getTopDuration(top50pTasks)
 				report.Top90th = mostDuration
 				report.Top99th = mostDuration
 				report.Top99p9th = mostDuration