diff --git a/prisma/schema.prisma b/prisma/schema.prisma
index 9dcc64d..3fbd4d9 100644
--- a/prisma/schema.prisma
+++ b/prisma/schema.prisma
@@ -284,6 +284,9 @@ model SimulatorRun {
   promptVersion    PromptVersion? @relation(fields: [promptVersionId], references: [id], onDelete: SetNull)
   model            Model          @relation(fields: [modelId], references: [id])
 
+  // 添加索引优化查询性能
+  @@index([userId, createdAt(sort: Desc)])
+  @@index([userId, status, createdAt(sort: Desc)])
   @@map("simulator_runs")
 }
 
diff --git a/src/app/api/simulator/route.ts b/src/app/api/simulator/route.ts
index 10d1f59..19cd908 100644
--- a/src/app/api/simulator/route.ts
+++ b/src/app/api/simulator/route.ts
@@ -95,11 +95,9 @@ export async function GET(request: NextRequest) {
           output: true,
           error: true,
           createdAt: true,
-          completedAt: true,
           inputTokens: true,
           outputTokens: true,
           totalCost: true,
-          duration: true,
           prompt: {
             select: { id: true, name: true }
           },
diff --git a/src/app/simulator/page.tsx b/src/app/simulator/page.tsx
index 9058508..6e83ff7 100644
--- a/src/app/simulator/page.tsx
+++ b/src/app/simulator/page.tsx
@@ -1,6 +1,6 @@
 'use client'
 
-import { useState, useEffect, useCallback } from 'react'
+import { useState, useEffect, useCallback, useMemo } from 'react'
 import { useTranslations } from 'next-intl'
 import { useAuthUser } from '@/hooks/useAuthUser'
 import { Header } from '@/components/layout/Header'
@@ -160,7 +160,7 @@ export default function SimulatorPage() {
     }
   }
 
-  const getRunStats = () => {
+  const stats = useMemo(() => {
     const total = runs.length
     const completed = runs.filter(run => run.status === 'completed').length
     const running = runs.filter(run => run.status === 'running').length
@@ -173,7 +173,7 @@ export default function SimulatorPage() {
     const totalCost = runs.reduce((sum, run) => sum + (run.totalCost || 0), 0)
     
     return { total, completed, running, failed, totalTokens, totalCost }
-  }
+  }, [runs])
 
   if (authLoading) {
     return (
@@ -190,7 +190,6 @@ export default function SimulatorPage() {
     return null
   }
 
-  const stats = getRunStats()
 
   return (
     <div className="min-h-screen">