diff --git a/src/api/baidu/mapWsQuote.ts b/src/api/baidu/mapWsQuote.ts
index 9e8ba46..215bd4d 100644
--- a/src/api/baidu/mapWsQuote.ts
+++ b/src/api/baidu/mapWsQuote.ts
@@ -58,7 +58,7 @@ function upsertIntraday(
   const price = toNum(priceRaw)
   const avg = toNum(avgRaw)
   const totalVolume = toNum(totalVolumeRaw)
-  const list = [...points]
+  const list = points.slice()
   const idx = list.findIndex((p) => p.time === time)
 
   const othersSum = list.reduce((s, p, i) => (i === idx ? s : s + p.volume), 0)
@@ -73,8 +73,11 @@ function upsertIntraday(
   return list
 }
 
-/** Merge tick detailinfos into quote.trades (newest first, dedupe, cap 200). */
-export function applyWsTick(quote: QuoteData, data: BaiduWsTickData): QuoteData {
+/**
+ * Merge tick detailinfos into quote.trades (newest first, dedupe, cap 200).
+ * Mutates quote in place so Vue only invalidates trade-dependent effects.
+ */
+export function applyWsTick(quote: QuoteData, data: BaiduWsTickData): void {
   const incoming: TradeTick[] = [...(data.detailinfos ?? [])]
     .reverse()
     .map((t) => ({
@@ -93,26 +96,27 @@ export function applyWsTick(quote: QuoteData, data: BaiduWsTickData): QuoteData
     merged.push(t)
     if (merged.length >= MAX_TRADES) break
   }
-  return { ...quote, trades: merged }
+  quote.trades = merged
 }
 
-/** Apply snapshot fields onto quote (price, book, pankou, intraday point). */
-export function applyWsSnapshot(quote: QuoteData, data: BaiduWsSnapshotData): QuoteData {
-  const next: QuoteData = { ...quote }
-
+/**
+ * Apply snapshot fields onto quote (price, book, pankou, intraday point).
+ * Mutates quote in place — do not replace quote.value, or every tick rebuilds charts.
+ */
+export function applyWsSnapshot(quote: QuoteData, data: BaiduWsSnapshotData): void {
   if (data.cur) {
     const c = data.cur
-    if (c.price != null) next.last = toNum(c.price, next.last)
-    if (c.increase != null) next.change = toNum(c.increase, next.change)
-    if (c.ratio != null) next.changePercent = toNum(c.ratio, next.changePercent)
-    if (c.avgPrice != null) next.avg = toNum(c.avgPrice, next.avg)
-    if (c.status) next.status = c.status
+    if (c.price != null) quote.last = toNum(c.price, quote.last)
+    if (c.increase != null) quote.change = toNum(c.increase, quote.change)
+    if (c.ratio != null) quote.changePercent = toNum(c.ratio, quote.changePercent)
+    if (c.avgPrice != null) quote.avg = toNum(c.avgPrice, quote.avg)
+    if (c.status) quote.status = c.status
   }
 
   if (data.update) {
-    if (data.update.text) next.updatedAt = data.update.text
-    if (data.update.stockStatus) next.status = data.update.stockStatus
-    else if (data.update.tradeStatusCN) next.status = data.update.tradeStatusCN
+    if (data.update.text) quote.updatedAt = data.update.text
+    if (data.update.stockStatus) quote.status = data.update.stockStatus
+    else if (data.update.tradeStatusCN) quote.status = data.update.tradeStatusCN
   }
 
   if (data.pankouinfos?.length) {
@@ -120,20 +124,20 @@ export function applyWsSnapshot(quote: QuoteData, data: BaiduWsSnapshotData): Qu
     const num = (ename: string, fallback: number) =>
       by[ename] ? toNum(by[ename]!.originValue ?? by[ename]!.value, fallback) : fallback
 
-    next.open = num('open', next.open)
-    next.high = num('high', next.high)
-    next.low = num('low', next.low)
-    next.prevClose = num('preClose', next.prevClose)
-    next.volume = num('volume', next.volume)
-    next.openInterest = num('holdingAmount', next.openInterest)
-    next.amplitude = num('amplitudeRatio', next.amplitude)
-    next.settlement = num('settlement', next.settlement)
-    next.prevSettlement = num('prevSettlement', next.prevSettlement)
-    next.outerVol = num('outside', next.outerVol)
-    next.innerVol = num('inside', next.innerVol)
-    if (by.avgPrice) next.avg = num('avgPrice', next.avg)
+    quote.open = num('open', quote.open)
+    quote.high = num('high', quote.high)
+    quote.low = num('low', quote.low)
+    quote.prevClose = num('preClose', quote.prevClose)
+    quote.volume = num('volume', quote.volume)
+    quote.openInterest = num('holdingAmount', quote.openInterest)
+    quote.amplitude = num('amplitudeRatio', quote.amplitude)
+    quote.settlement = num('settlement', quote.settlement)
+    quote.prevSettlement = num('prevSettlement', quote.prevSettlement)
+    quote.outerVol = num('outside', quote.outerVol)
+    quote.innerVol = num('inside', quote.innerVol)
+    if (by.avgPrice) quote.avg = num('avgPrice', quote.avg)
     if (by.amount) {
-      next.amount = parseAmountYi(by.amount.value, by.amount.originValue)
+      quote.amount = parseAmountYi(by.amount.value, by.amount.originValue)
     }
     if (by.amountDelta) {
       const raw = by.amountDelta.originValue
@@ -141,7 +145,7 @@ export function applyWsSnapshot(quote: QuoteData, data: BaiduWsSnapshotData): Qu
       const unavailable =
         (raw == null || !Number.isFinite(raw)) && (!display || display === '--')
       if (!unavailable) {
-        next.amountDelta = parseAmountDelta(display, raw)
+        quote.amountDelta = parseAmountDelta(display, raw)
       }
     }
   }
@@ -166,20 +170,18 @@ export function applyWsSnapshot(quote: QuoteData, data: BaiduWsSnapshotData): Qu
     const bidVol = bids.reduce((s, b) => s + b.volume, 0)
     const askVol = asks.reduce((s, a) => s + a.volume, 0)
     const total = bidVol + askVol
-    next.orderBook = { asks, bids }
-    next.buyRatio = total > 0 ? Math.round((bidVol / total) * 100) : 50
-    next.sellRatio = 100 - next.buyRatio
+    quote.orderBook = { asks, bids }
+    quote.buyRatio = total > 0 ? Math.round((bidVol / total) * 100) : 50
+    quote.sellRatio = 100 - quote.buyRatio
   }
 
   if (data.point) {
-    next.intraday = upsertIntraday(
-      next.intraday,
+    quote.intraday = upsertIntraday(
+      quote.intraday,
       data.point.price,
       data.point.avgPrice,
       data.point.time,
       data.point.totalVolume,
     )
   }
-
-  return next
 }
diff --git a/src/components/quote/ChartPanel.vue b/src/components/quote/ChartPanel.vue
index 439ecbc..463f33c 100644
--- a/src/components/quote/ChartPanel.vue
+++ b/src/components/quote/ChartPanel.vue
@@ -6,12 +6,12 @@
       <el-tab-pane :label="TAB.week" name="week" />
       <el-tab-pane :label="TAB.month" name="month" />
     </el-tabs>
-    <v-chart class="chart" :option="option" autoresize />
+    <v-chart class="chart" :option="option" :update-options="updateOpts" autoresize />
   </div>
 </template>
 
 <script setup lang="ts">
-import { computed, ref } from 'vue'
+import { onUnmounted, ref, watch } from 'vue'
 import { use } from 'echarts/core'
 import { CanvasRenderer } from 'echarts/renderers'
 import { LineChart, BarChart, CandlestickChart } from 'echarts/charts'
@@ -23,7 +23,7 @@ import {
 } from 'echarts/components'
 import type { EChartsOption } from 'echarts'
 import VChart from 'vue-echarts'
-import type { Candle, QuoteData } from '../../types'
+import type { Candle, IntradayPoint, QuoteData } from '../../types'
 import type { KlinePeriod } from '../../stores/quota'
 
 use([
@@ -37,7 +37,7 @@ use([
   LegendComponent,
 ])
 
-/** ASCII-safe unicode escapes ? avoids Windows encoding corruption */
+/** ASCII-safe unicode escapes — avoids Windows encoding corruption */
 const TAB = {
   intraday: '\u5206\u65f6',
   day: '\u65e5K',
@@ -53,6 +53,9 @@ interface ColorParam {
   dataIndex?: number
 }
 
+/** Throttle chart option rebuilds under high-frequency WS snapshots. */
+const CHART_THROTTLE_MS = 400
+
 const props = defineProps<{
   quote: QuoteData
   klineLoading?: boolean
@@ -60,27 +63,71 @@ const props = defineProps<{
 }>()
 
 const period = ref<ChartPeriod>('intraday')
+const option = ref<EChartsOption>({})
+const updateOpts = { notMerge: true, lazyUpdate: true }
+
+let throttleTimer: ReturnType<typeof setTimeout> | null = null
+let pendingBuild = false
 
 async function onTabChange(name: string | number) {
   if (name === 'day' || name === 'week' || name === 'month') {
     await props.loadKline(name)
   }
+  flushOption(true)
 }
 
-const option = computed((): EChartsOption => {
+function buildOption(): EChartsOption {
   if (period.value === 'intraday') {
-    return buildIntradayOption(props.quote)
+    return buildIntradayOption(props.quote.intraday, props.quote.prevSettlement)
   }
   return buildCandleOption(props.quote.candles[period.value])
+}
+
+function flushOption(immediate = false) {
+  if (immediate) {
+    if (throttleTimer) {
+      clearTimeout(throttleTimer)
+      throttleTimer = null
+    }
+    pendingBuild = false
+    option.value = buildOption()
+    return
+  }
+  if (throttleTimer) {
+    pendingBuild = true
+    return
+  }
+  option.value = buildOption()
+  throttleTimer = setTimeout(() => {
+    throttleTimer = null
+    if (pendingBuild) {
+      pendingBuild = false
+      option.value = buildOption()
+    }
+  }, CHART_THROTTLE_MS)
+}
+
+// Only depend on chart-relevant fields (not trades / orderBook).
+watch(
+  () => {
+    if (period.value === 'intraday') {
+      return [period.value, props.quote.intraday, props.quote.prevSettlement] as const
+    }
+    return [period.value, props.quote.candles[period.value]] as const
+  },
+  () => flushOption(false),
+  { immediate: true },
+)
+
+onUnmounted(() => {
+  if (throttleTimer) clearTimeout(throttleTimer)
 })
 
-function buildIntradayOption(quote: QuoteData): EChartsOption {
-  const points = quote.intraday
+function buildIntradayOption(points: IntradayPoint[], base: number): EChartsOption {
   const times = points.map((p) => p.time)
   const prices = points.map((p) => p.price)
   const avgs = points.map((p) => p.avg)
   const vols = points.map((p) => p.volume)
-  const base = quote.prevSettlement
 
   return {
     animation: false,
@@ -121,7 +168,8 @@ function buildIntradayOption(quote: QuoteData): EChartsOption {
         position: 'right',
         axisLabel: {
           fontSize: 10,
-          formatter: (v: number) => `${(((v - base) / base) * 100).toFixed(2)}%`,
+          formatter: (v: number) =>
+            base ? `${(((v - base) / base) * 100).toFixed(2)}%` : '0.00%',
         },
         splitLine: { show: false },
         gridIndex: 0,
diff --git a/src/components/quote/LargeOrderAnalysis.vue b/src/components/quote/LargeOrderAnalysis.vue
index a302568..07a1797 100644
--- a/src/components/quote/LargeOrderAnalysis.vue
+++ b/src/components/quote/LargeOrderAnalysis.vue
@@ -11,7 +11,7 @@
           </div>
         </div>
       </div>
-      <v-chart class="chart" :option="option" autoresize />
+      <v-chart class="chart" :option="option" :update-options="updateOpts" autoresize />
       <div class="legend right">
         <div v-for="item in sellItems" :key="item.key" class="legend-item">
           <span class="swatch" :style="{ background: item.color }" />
@@ -26,7 +26,7 @@
 </template>
 
 <script setup lang="ts">
-import { computed } from 'vue'
+import { computed, onUnmounted, ref, watch } from 'vue'
 import { storeToRefs } from 'pinia'
 import { use } from 'echarts/core'
 import { CanvasRenderer } from 'echarts/renderers'
@@ -39,6 +39,8 @@ import type { QuoteData, TradeTick } from '../../types'
 
 use([CanvasRenderer, PieChart, TooltipComponent])
 
+const PIE_THROTTLE_MS = 500
+
 const props = defineProps<{
   quote: QuoteData
 }>()
@@ -123,18 +125,23 @@ function toItems(
   return { buyItems, sellItems, data: [...buyItems, ...sellItems] }
 }
 
-const stats = computed(() => toItems(aggregate(props.quote.trades, threshold.value)))
+const stats = ref(toItems(aggregate([], threshold.value)))
 const buyItems = computed(() => stats.value.buyItems)
 const sellItems = computed(() => stats.value.sellItems)
+const option = ref<EChartsOption>({})
+const updateOpts = { notMerge: true, lazyUpdate: true }
 
-const option = computed((): EChartsOption => {
-  const data = stats.value.data.map((d) => ({
+let throttleTimer: ReturnType<typeof setTimeout> | null = null
+let pending = false
+
+function buildPieOption(items: ReturnType<typeof toItems>): EChartsOption {
+  const data = items.data.map((d) => ({
     name: d.name,
     value: d.value,
     itemStyle: { color: d.color },
   }))
-
   return {
+    animation: false,
     tooltip: {
       trigger: 'item',
       formatter: '{b}<br/>手数: {c}<br/>占比: {d}%',
@@ -151,6 +158,35 @@ const option = computed((): EChartsOption => {
       },
     ],
   }
+}
+
+function flushStats() {
+  const next = toItems(aggregate(props.quote.trades, threshold.value))
+  stats.value = next
+  option.value = buildPieOption(next)
+}
+
+watch(
+  () => [props.quote.trades, threshold.value] as const,
+  () => {
+    if (throttleTimer) {
+      pending = true
+      return
+    }
+    flushStats()
+    throttleTimer = setTimeout(() => {
+      throttleTimer = null
+      if (pending) {
+        pending = false
+        flushStats()
+      }
+    }, PIE_THROTTLE_MS)
+  },
+  { immediate: true },
+)
+
+onUnmounted(() => {
+  if (throttleTimer) clearTimeout(throttleTimer)
 })
 </script>
 
diff --git a/src/composables/useAiAdvice.ts b/src/composables/useAiAdvice.ts
index fe50436..aa6f343 100644
--- a/src/composables/useAiAdvice.ts
+++ b/src/composables/useAiAdvice.ts
@@ -108,8 +108,10 @@ export function useAiAdvice() {
         snapshot: quota.getAnalysisSnapshot(),
       }
 
-      console.log('[AI] 提交给 DeepSeek 的关键词', payload.keywords)
-      console.log('[AI] 提交给 DeepSeek 的数据快照', payload.snapshot)
+      // 勿 console.log 完整 snapshot：DevTools 会长期持有大对象导致内存暴涨
+      if (import.meta.env.DEV) {
+        console.log('[AI] 分析', payload.snapshot.contract.code, payload.keywords.slice(0, 80))
+      }
 
       const advice = await fetchDeepSeekAdvice(apiKey, payload)
       if (epoch !== analysisEpoch) return
diff --git a/src/stores/quota.ts b/src/stores/quota.ts
index 93413bd..39319af 100644
--- a/src/stores/quota.ts
+++ b/src/stores/quota.ts
@@ -137,10 +137,11 @@ export const useQuotaStore = defineStore('quota', () => {
     const code = activeContract().code
     if (msg.data.code && msg.data.code !== code) return
     const product = msg.data.product
+    // Mutate in place — replacing quote.value forces every chart/UI to rebuild.
     if (product === 'tick') {
-      quote.value = applyWsTick(quote.value, msg.data as BaiduWsTickData)
+      applyWsTick(quote.value, msg.data as BaiduWsTickData)
     } else if (product === 'snapshot') {
-      quote.value = applyWsSnapshot(quote.value, msg.data as BaiduWsSnapshotData)
+      applyWsSnapshot(quote.value, msg.data as BaiduWsSnapshotData)
     }
   }
 
@@ -181,10 +182,11 @@ export const useQuotaStore = defineStore('quota', () => {
     startSessionWatch()
   }
 
-  /** (Re)connect only while page wants WS and within trading session. */
+  /** Connect only while page wants WS and within trading session; skip if already running. */
   function connectWs() {
     if (!wsDesired || !isWsTradingSession()) return
     wsInSession.value = true
+    if (quoteWs?.isRunning()) return
     quoteWs?.disconnect()
     quoteWs = new BaiduQuoteWs({
       onMessage: handleWsMessage,