diff --git a/src/main/index.ts b/src/main/index.ts
index c45876e..314360d 100644
--- a/src/main/index.ts
+++ b/src/main/index.ts
@@ -22,6 +22,7 @@ import type {
   ThemeLibrarySnapshot,
 } from '../types/theme'
 import { RESIZE_DIRECTIONS, type ResizeDirection } from '../types/windowResize'
+import type { PerformanceMemorySnapshot } from '../types/performance'
 import { normalizeProfile } from '../shared/profileState'
 import { calculateResizedWindowBounds } from '../shared/windowResize'
 import { FileBackedProfileLibrary } from './profileLibrary'
@@ -70,6 +71,25 @@ const POPOUT_DEFAULTS = {
   minHeight: 160,
 }
 
+function kilobytesToMegabytes(value: number | undefined): number {
+  return Math.round((((value ?? 0) / 1024) * 10)) / 10
+}
+
+function workingSetForMetric(metric: Electron.ProcessMetric | undefined): number {
+  return kilobytesToMegabytes(metric?.memory.workingSetSize)
+}
+
+function sumWorkingSet(metrics: Electron.ProcessMetric[], predicate: (metric: Electron.ProcessMetric) => boolean): number {
+  let totalKilobytes = 0
+  for (const metric of metrics) {
+    if (!predicate(metric)) {
+      continue
+    }
+    totalKilobytes += metric.memory.workingSetSize
+  }
+  return kilobytesToMegabytes(totalKilobytes)
+}
+
 function getProfileLibrary(): FileBackedProfileLibrary {
   if (!profileLibrary) {
     profileLibrary = new FileBackedProfileLibrary(
@@ -903,6 +923,25 @@ function setupIPC(): void {
     return getWindowFromSender(event.sender)?.isAlwaysOnTop() ?? true
   })
 
+  ipcMain.handle('performance:get-memory-snapshot', async (event): Promise<PerformanceMemorySnapshot> => {
+    const metrics = app.getAppMetrics()
+    const senderPid = event.sender.getOSProcessId()
+    const browserMetric = metrics.find((metric) => metric.type === 'Browser')
+    const rendererMetric = metrics.find((metric) => metric.pid === senderPid)
+
+    return {
+      capturedAt: Date.now(),
+      appMb: sumWorkingSet(metrics, () => true),
+      mainMb: workingSetForMetric(browserMetric),
+      rendererMb: workingSetForMetric(rendererMetric),
+      rendererPrivateMb: null,
+      gpuMb: sumWorkingSet(metrics, (metric) => metric.type === 'GPU'),
+      utilityMb: sumWorkingSet(metrics, (metric) => metric.type === 'Utility'),
+      jsHeapUsedMb: null,
+      jsHeapLimitMb: null,
+    }
+  })
+
   ipcMain.handle('audio:get-desktop-sources', async () => {
     const sources = await desktopCapturer.getSources({ types: ['screen'] })
     return sources.map((s) => ({ id: s.id, name: s.name }))
diff --git a/src/preload/index.ts b/src/preload/index.ts
index a3d6620..64b7be6 100644
--- a/src/preload/index.ts
+++ b/src/preload/index.ts
@@ -28,9 +28,14 @@ import type {
 } from '../types/theme'
 import type { ResizeDirection } from '../types/windowResize'
 import type { VisualizerDSP } from '../renderer/audio/native/visualizer-dsp'
+import type { PerformanceMemorySnapshot } from '../types/performance'
 
 type NativeAddonModule = VisualizerDSP & NativeCaptureAPI
 
+function kilobytesToMegabytes(value: number | undefined): number {
+  return Math.round((((value ?? 0) / 1024) * 10)) / 10
+}
+
 // Expose Electron API to renderer
 contextBridge.exposeInMainWorld('electronAPI', {
   platform: process.platform,
@@ -45,6 +50,18 @@ contextBridge.exposeInMainWorld('electronAPI', {
   repositionWindow: (position: 'top' | 'bottom') => ipcRenderer.send('window:reposition', position),
   toggleAlwaysOnTop: () => ipcRenderer.send('window:toggle-always-on-top'),
   isAlwaysOnTop: () => ipcRenderer.invoke('window:is-always-on-top'),
+  getPerformanceMemorySnapshot: async () => {
+    const snapshot = await ipcRenderer.invoke('performance:get-memory-snapshot') as PerformanceMemorySnapshot
+    try {
+      const rendererMemory = await process.getProcessMemoryInfo()
+      return {
+        ...snapshot,
+        rendererPrivateMb: kilobytesToMegabytes(rendererMemory.private),
+      } satisfies PerformanceMemorySnapshot
+    } catch {
+      return snapshot
+    }
+  },
   getDesktopSources: () => ipcRenderer.invoke('audio:get-desktop-sources') as Promise<{ id: string; name: string }[]>,
   getCaptureBackendSupport: async () => {
     const support = await ipcRenderer.invoke('capture:get-backend-support') as CaptureBackendSupport
diff --git a/src/renderer/App.tsx b/src/renderer/App.tsx
index f0fdcd6..1c4fa1d 100644
--- a/src/renderer/App.tsx
+++ b/src/renderer/App.tsx
@@ -8,6 +8,7 @@ import WindowResizeOverlay from './components/WindowResizeOverlay'
 import { useSettingsStore } from './stores/settingsStore'
 import { useAstraStore } from './stores/astraStore'
 import { useAudioStore } from './stores/audioStore'
+import { usePerformanceStore } from './stores/performanceStore'
 import { useThemeStore } from './stores/themeStore'
 import { SCOPE_KINDS } from '../types/scope'
 
@@ -27,6 +28,8 @@ export default function App(): JSX.Element {
   const guardProfileTransition = useSettingsStore((s) => s.guardProfileTransition)
   const importProfileFromPath = useSettingsStore((s) => s.importProfileFromPath)
   const updateMainWindowBounds = useSettingsStore((s) => s.updateMainWindowBounds)
+  const startMemoryMonitoring = usePerformanceStore((s) => s.startMemoryMonitoring)
+  const stopMemoryMonitoring = usePerformanceStore((s) => s.stopMemoryMonitoring)
   const initializeThemes = useThemeStore((s) => s.initializeThemes)
   const applyExternalThemeSnapshot = useThemeStore((s) => s.applyExternalThemeSnapshot)
   const initializeAstra = useAstraStore((s) => s.initialize)
@@ -102,6 +105,13 @@ export default function App(): JSX.Element {
     updateMainWindowBounds,
   ])
 
+  useEffect(() => {
+    startMemoryMonitoring()
+    return () => {
+      stopMemoryMonitoring()
+    }
+  }, [startMemoryMonitoring, stopMemoryMonitoring])
+
   const measuredSettingsHeight = settingsPanelHeight > 0 && bottomBarHeight > 0
     ? settingsPanelHeight + bottomBarHeight
     : DEFAULT_SETTINGS_HEIGHT
diff --git a/src/renderer/components/BottomBar.tsx b/src/renderer/components/BottomBar.tsx
index 6892ea3..27d7561 100644
--- a/src/renderer/components/BottomBar.tsx
+++ b/src/renderer/components/BottomBar.tsx
@@ -46,6 +46,9 @@ export default function BottomBar({ onClose, onHeightChange }: BottomBarProps):
   const toggleScope = useSettingsStore((s) => s.toggleScope)
   const frameTarget = usePerformanceStore((s) => s.frameTarget)
   const dockedRenderFps = usePerformanceStore((s) => s.dockedRenderFps)
+  const memorySample = usePerformanceStore((s) => s.memorySample)
+  const rendererMemoryDeltaMb = usePerformanceStore((s) => s.rendererMemoryDeltaMb)
+  const appMemoryDeltaMb = usePerformanceStore((s) => s.appMemoryDeltaMb)
   const setFrameTarget = usePerformanceStore((s) => s.setFrameTarget)
   const themeId = useSettingsStore((s) => s.themeId)
   const setThemeId = useSettingsStore((s) => s.setThemeId)
@@ -155,6 +158,9 @@ export default function BottomBar({ onClose, onHeightChange }: BottomBarProps):
   const trimPercent = Math.min(100, Math.max(0, ((inputGainDb + 12) / 24) * 100))
   const roundedDockedRenderFps = Math.max(0, Math.round(dockedRenderFps))
   const themeEntries = Object.entries(themes)
+  const rendererMemoryMb = memorySample?.rendererPrivateMb ?? memorySample?.rendererMb ?? 0
+  const jsHeapUsedMb = memorySample?.jsHeapUsedMb ?? null
+  const jsHeapLimitMb = memorySample?.jsHeapLimitMb ?? null
 
   const handleThemeChange = async (value: string): Promise<void> => {
     await loadTheme(value)
@@ -435,6 +441,28 @@ export default function BottomBar({ onClose, onHeightChange }: BottomBarProps):
                   <span>{roundedDockedRenderFps} FPS</span>
                 </div>
               </div>
+
+              {memorySample ? (
+                <div className="bottom-bar__inline bottom-bar__inline--memory">
+                  <div className="settings-status-pill bottom-bar__memory-pill" title="Whole-app working set from Electron process metrics">
+                    <span>App {memorySample.appMb.toFixed(1)} MB</span>
+                  </div>
+                  <div className="settings-status-pill bottom-bar__memory-pill" title="Current renderer private memory when available, otherwise working set">
+                    <span>Renderer {rendererMemoryMb.toFixed(1)} MB</span>
+                  </div>
+                  <div className="settings-status-pill bottom-bar__memory-pill" title="Growth since the first sample in this session">
+                    <span>ΔR {rendererMemoryDeltaMb >= 0 ? '+' : ''}{rendererMemoryDeltaMb.toFixed(1)} MB</span>
+                  </div>
+                  <div className="settings-status-pill bottom-bar__memory-pill" title="Whole-app growth since the first sample in this session">
+                    <span>ΔA {appMemoryDeltaMb >= 0 ? '+' : ''}{appMemoryDeltaMb.toFixed(1)} MB</span>
+                  </div>
+                  {jsHeapUsedMb !== null ? (
+                    <div className="settings-status-pill bottom-bar__memory-pill" title={jsHeapLimitMb !== null ? `Renderer JS heap (${jsHeapUsedMb.toFixed(1)} / ${jsHeapLimitMb.toFixed(1)} MB)` : 'Renderer JS heap'}>
+                      <span>JS {jsHeapUsedMb.toFixed(1)} MB</span>
+                    </div>
+                  ) : null}
+                </div>
+              ) : null}
             </div>
           </section>
 
diff --git a/src/renderer/env.d.ts b/src/renderer/env.d.ts
index a1b9465..fbcebaa 100644
--- a/src/renderer/env.d.ts
+++ b/src/renderer/env.d.ts
@@ -29,6 +29,7 @@ import type {
   ThemeLibrarySnapshot,
 } from '../types/theme'
 import type { ResizeDirection } from '../types/windowResize'
+import type { PerformanceMemorySnapshot } from '../types/performance'
 
 declare global {
   interface Window {
@@ -47,6 +48,7 @@ declare global {
       repositionWindow: (position: 'top' | 'bottom') => void
       toggleAlwaysOnTop: () => void
       isAlwaysOnTop: () => Promise<boolean>
+      getPerformanceMemorySnapshot: () => Promise<PerformanceMemorySnapshot>
       getDesktopSources: () => Promise<{ id: string; name: string }[]>
       getCaptureBackendSupport: () => Promise<CaptureBackendSupport>
       getAstraConfig: () => Promise<AstraIntegrationConfig>
diff --git a/src/renderer/stores/performanceStore.ts b/src/renderer/stores/performanceStore.ts
index 92cb727..ee27ce7 100644
--- a/src/renderer/stores/performanceStore.ts
+++ b/src/renderer/stores/performanceStore.ts
@@ -1,5 +1,9 @@
 import { create } from 'zustand'
-import { isVisualizerFrameTarget, type VisualizerFrameTarget } from '../../types/performance'
+import {
+  isVisualizerFrameTarget,
+  type PerformanceMemorySnapshot,
+  type VisualizerFrameTarget,
+} from '../../types/performance'
 
 const STORAGE_KEY = 'prism:performance'
 const SYNC_CHANNEL_NAME = 'prism:performance'
@@ -11,8 +15,14 @@ interface PersistedPerformanceState {
 interface PerformanceState {
   frameTarget: VisualizerFrameTarget
   dockedRenderFps: number
+  memorySample: PerformanceMemorySnapshot | null
+  memoryHistory: PerformanceMemorySnapshot[]
+  rendererMemoryDeltaMb: number
+  appMemoryDeltaMb: number
   setFrameTarget: (target: VisualizerFrameTarget) => void
   setDockedRenderFps: (fps: number) => void
+  startMemoryMonitoring: () => void
+  stopMemoryMonitoring: () => void
 }
 
 interface StorageLike {
@@ -66,10 +76,110 @@ function persistPerformancePreferences(target: VisualizerFrameTarget, storage =
 }
 
 const storedPreferences = loadPerformancePreferences()
+const MEMORY_SAMPLE_INTERVAL_MS = 5000
+const MEMORY_HISTORY_LIMIT = 720
+
+interface ChromiumPerformanceMemory {
+  jsHeapSizeLimit: number
+  totalJSHeapSize: number
+  usedJSHeapSize: number
+}
+
+let memoryMonitorTimer: ReturnType<typeof setInterval> | null = null
+let memoryMonitorRefCount = 0
+let memoryMonitorInFlight = false
+
+function isMainWindowContext(): boolean {
+  if (typeof window === 'undefined') {
+    return false
+  }
+
+  const params = new URLSearchParams(window.location.search)
+  return params.get('window') !== 'scope-popout'
+}
+
+function bytesToMegabytes(value: number | undefined): number {
+  return Math.round((((value ?? 0) / (1024 * 1024)) * 10)) / 10
+}
+
+async function collectMemorySnapshot(): Promise<PerformanceMemorySnapshot | null> {
+  if (typeof window === 'undefined' || typeof window.electronAPI?.getPerformanceMemorySnapshot !== 'function') {
+    return null
+  }
+
+  const snapshot = await window.electronAPI.getPerformanceMemorySnapshot()
+  const performanceWithMemory = performance as Performance & { memory?: ChromiumPerformanceMemory }
+  const heap = performanceWithMemory.memory
+  return {
+    ...snapshot,
+    jsHeapUsedMb: heap ? bytesToMegabytes(heap.usedJSHeapSize) : null,
+    jsHeapLimitMb: heap ? bytesToMegabytes(heap.jsHeapSizeLimit) : null,
+  }
+}
+
+async function sampleMemory(): Promise<void> {
+  if (memoryMonitorInFlight) {
+    return
+  }
+
+  memoryMonitorInFlight = true
+  try {
+    const snapshot = await collectMemorySnapshot()
+    if (!snapshot) {
+      return
+    }
+
+    usePerformanceStore.setState((state) => {
+      const baseline = state.memoryHistory[0] ?? snapshot
+      const nextHistory = [...state.memoryHistory, snapshot]
+      if (nextHistory.length > MEMORY_HISTORY_LIMIT) {
+        nextHistory.splice(0, nextHistory.length - MEMORY_HISTORY_LIMIT)
+      }
+
+      const baselineRendererMb = baseline.rendererPrivateMb ?? baseline.rendererMb
+      const currentRendererMb = snapshot.rendererPrivateMb ?? snapshot.rendererMb
+
+      return {
+        memorySample: snapshot,
+        memoryHistory: nextHistory,
+        rendererMemoryDeltaMb: Math.round((currentRendererMb - baselineRendererMb) * 10) / 10,
+        appMemoryDeltaMb: Math.round((snapshot.appMb - baseline.appMb) * 10) / 10,
+      }
+    })
+  } finally {
+    memoryMonitorInFlight = false
+  }
+}
+
+function ensureMemoryMonitor(): void {
+  if (memoryMonitorTimer || !isMainWindowContext()) {
+    return
+  }
+
+  void sampleMemory()
+  memoryMonitorTimer = setInterval(() => {
+    void sampleMemory()
+  }, MEMORY_SAMPLE_INTERVAL_MS)
+}
+
+function releaseMemoryMonitor(): void {
+  if (memoryMonitorRefCount > 0) {
+    return
+  }
+
+  if (memoryMonitorTimer) {
+    clearInterval(memoryMonitorTimer)
+    memoryMonitorTimer = null
+  }
+}
 
 export const usePerformanceStore = create<PerformanceState>((set) => ({
   frameTarget: storedPreferences.frameTarget,
   dockedRenderFps: 0,
+  memorySample: null,
+  memoryHistory: [],
+  rendererMemoryDeltaMb: 0,
+  appMemoryDeltaMb: 0,
 
   setFrameTarget: (target: VisualizerFrameTarget) => {
     persistPerformancePreferences(target)
@@ -87,6 +197,16 @@ export const usePerformanceStore = create<PerformanceState>((set) => ({
       return { ...state, dockedRenderFps: nextFps }
     })
   },
+
+  startMemoryMonitoring: () => {
+    memoryMonitorRefCount += 1
+    ensureMemoryMonitor()
+  },
+
+  stopMemoryMonitoring: () => {
+    memoryMonitorRefCount = Math.max(0, memoryMonitorRefCount - 1)
+    releaseMemoryMonitor()
+  },
 }))
 
 let syncChannel: BroadcastChannel | null = null
diff --git a/src/renderer/styles/globals.css b/src/renderer/styles/globals.css
index 59297cd..a60262c 100644
--- a/src/renderer/styles/globals.css
+++ b/src/renderer/styles/globals.css
@@ -1414,6 +1414,12 @@ select {
   gap: 10px;
 }
 
+.bottom-bar__inline--memory {
+  gap: 6px;
+  flex-wrap: wrap;
+  white-space: normal;
+}
+
 .bottom-bar__divider {
   width: 1px;
   align-self: stretch;
@@ -1483,6 +1489,13 @@ select {
   letter-spacing: 0.08em;
 }
 
+.bottom-bar__memory-pill {
+  justify-content: center;
+  color: var(--text-primary);
+  font-family: 'JetBrains Mono', monospace;
+  letter-spacing: 0.06em;
+}
+
 .bottom-bar__error-text {
   margin-top: 0;
   max-width: 360px;
diff --git a/src/types/performance.ts b/src/types/performance.ts
index 3d85d18..9001fd7 100644
--- a/src/types/performance.ts
+++ b/src/types/performance.ts
@@ -2,6 +2,18 @@ export const VISUALIZER_FRAME_TARGETS = [10, 30, 60, 120, 144, 'display-sync'] a
 
 export type VisualizerFrameTarget = typeof VISUALIZER_FRAME_TARGETS[number]
 
+export interface PerformanceMemorySnapshot {
+  capturedAt: number
+  appMb: number
+  mainMb: number
+  rendererMb: number
+  rendererPrivateMb: number | null
+  gpuMb: number
+  utilityMb: number
+  jsHeapUsedMb: number | null
+  jsHeapLimitMb: number | null
+}
+
 export function isVisualizerFrameTarget(value: unknown): value is VisualizerFrameTarget {
   return VISUALIZER_FRAME_TARGETS.includes(value as VisualizerFrameTarget)
 }