diff --git a/src/main/services/AudioCaptureService.ts b/src/main/services/AudioCaptureService.ts
index 8ec608d..7340129 100644
--- a/src/main/services/AudioCaptureService.ts
+++ b/src/main/services/AudioCaptureService.ts
@@ -56,6 +56,7 @@ class AudioCaptureService extends EventEmitter {
   private _state: CaptureState = 'idle'
   private _currentDevice: AudioDevice | null = null
   private _refCount = 0
+  private _cachedDevices: AudioDevice[] | null = null
   private _soxProcess: ChildProcess | null = null
   private _stream: Readable | null = null
   private _levelInterval: ReturnType<typeof setInterval> | null = null
@@ -221,6 +222,9 @@ class AudioCaptureService extends EventEmitter {
   }
 
   async getDevices(): Promise<AudioDevice[]> {
+    // 캐싱: PowerShell 호출이 느리므로 한번만 실행
+    if (this._cachedDevices) return this._cachedDevices
+
     const devices: AudioDevice[] = [
       { deviceId: 'default', label: '시스템 기본 마이크', isDefault: true },
     ]
@@ -256,6 +260,7 @@ class AudioCaptureService extends EventEmitter {
       logger.warn(`Failed to enumerate audio devices via PowerShell: ${err instanceof Error ? err.message : String(err)}`)
     }
 
+    this._cachedDevices = devices
     logger.debug(`Found ${devices.length} audio device(s)`)
     return devices
   }