feat: added librespotConcurrency, which determines the threadpool of librespot api processes

routes/system/progress.py

@@ -59,7 +59,15 @@ class SSEBroadcaster:
             return
 
         # Add global task counts right before broadcasting - this is the single source of truth
-        enhanced_event_data = add_global_task_counts_to_event(event_data.copy())
+        # Skip expensive count recomputation for high-frequency callback/progress updates
+        try:
+            trigger_reason = event_data.get("trigger_reason")
+        except Exception:
+            trigger_reason = None
+        if trigger_reason and trigger_reason in {"callback_update", "progress_update"}:
+            enhanced_event_data = event_data.copy()
+        else:
+            enhanced_event_data = add_global_task_counts_to_event(event_data.copy())
         event_json = json.dumps(enhanced_event_data)
         sse_data = f"data: {event_json}\n\n"
 
@@ -133,14 +141,26 @@ def start_sse_redis_subscriber():
                                 )
                         elif event_type == "summary_update":
                             # Task summary update - use standardized trigger
-                            loop.run_until_complete(
+                            # Short-circuit if task no longer exists to avoid expensive processing
-                                trigger_sse_update(
+                            try:
-                                    task_id, event_data.get("reason", "update")
+                                if not get_task_info(task_id):
+                                    logger.debug(
+                                        f"SSE Redis Subscriber: summary_update for missing task {task_id}, skipping"
+                                    )
+                                else:
+                                    loop.run_until_complete(
+                                        trigger_sse_update(
+                                            task_id, event_data.get("reason", "update")
+                                        )
+                                    )
+                                    logger.debug(
+                                        f"SSE Redis Subscriber: Processed summary update for {task_id}"
+                                    )
+                            except Exception as _e:
+                                logger.error(
+                                    f"SSE Redis Subscriber: Error handling summary_update for {task_id}: {_e}",
+                                    exc_info=True,
                                 )
-                            )
-                            logger.debug(
-                                f"SSE Redis Subscriber: Processed summary update for {task_id}"
-                            )
                         else:
                             # Unknown event type - attempt to standardize and broadcast
                             standardized = standardize_incoming_event(event_data)
@@ -304,7 +324,7 @@ async def trigger_sse_update(task_id: str, reason: str = "task_update"):
         # Find the specific task that changed
         task_info = get_task_info(task_id)
         if not task_info:
-            logger.warning(f"SSE: Task {task_id} not found for update")
+            logger.debug(f"SSE: Task {task_id} not found for update")
             return
 
         last_status = get_last_task_status(task_id)

routes/utils/celery_config.py

@@ -41,6 +41,7 @@ DEFAULT_MAIN_CONFIG = {
     "saveCover": True,
     "maxConcurrentDownloads": 3,
     "utilityConcurrency": 1,
+    "librespotConcurrency": 2,
     "maxRetries": 3,
     "retryDelaySeconds": 5,
     "retryDelayIncrease": 5,

routes/utils/get_info.py

@@ -44,7 +44,11 @@ def get_client() -> LibrespotClient:
                     _shared_client.close()
             except Exception:
                 pass
-            _shared_client = LibrespotClient(stored_credentials_path=desired_blob)
+            cfg = get_config_params() or {}
+            max_workers = int(cfg.get("librespotConcurrency", 2) or 2)
+            _shared_client = LibrespotClient(
+                stored_credentials_path=desired_blob, max_workers=max_workers
+            )
             _shared_blob_path = desired_blob
         return _shared_client
 
@@ -59,7 +63,9 @@ def create_client(credentials_path: str) -> LibrespotClient:
     abs_path = os.path.abspath(credentials_path)
     if not os.path.isfile(abs_path):
         raise FileNotFoundError(f"Credentials file not found: {abs_path}")
-    return LibrespotClient(stored_credentials_path=abs_path)
+    cfg = get_config_params() or {}
+    max_workers = int(cfg.get("librespotConcurrency", 2) or 2)
+    return LibrespotClient(stored_credentials_path=abs_path, max_workers=max_workers)
 
 
 def close_client(client: LibrespotClient) -> None:

routes/utils/track.py

@@ -171,7 +171,6 @@ def download_track(
                             convert_to=convert_to,
                             bitrate=bitrate,
                             artist_separator=artist_separator,
-                            spotify_metadata=spotify_metadata,
                             pad_number_width=pad_number_width,
                         )
                         print(

spotizerr-ui/src/components/config/ServerTab.tsx

@@ -179,6 +179,77 @@ function UtilityConcurrencyForm() {
   );
 }
 
+function LibrespotConcurrencyForm() {
+  const queryClient = useQueryClient();
+  const { data: configData, isLoading } = useQuery({
+    queryKey: ["config"],
+    queryFn: () => authApiClient.getConfig<any>(),
+  });
+
+  const { register, handleSubmit, reset, formState: { isDirty } } = useForm<{ librespotConcurrency: number }>();
+
+  useEffect(() => {
+    if (configData) {
+      reset({ librespotConcurrency: Number(configData.librespotConcurrency ?? 2) });
+    }
+  }, [configData, reset]);
+
+  const mutation = useMutation({
+    mutationFn: (payload: { librespotConcurrency: number }) => authApiClient.updateConfig(payload),
+    onSuccess: () => {
+      toast.success("Librespot concurrency saved!");
+      queryClient.invalidateQueries({ queryKey: ["config"] });
+    },
+    onError: (e) => {
+      toast.error(`Failed to save: ${(e as any).message}`);
+    },
+  });
+
+  const onSubmit = (values: { librespotConcurrency: number }) => {
+    const raw = Number(values.librespotConcurrency || 2);
+    const safe = Math.max(1, Math.min(16, raw));
+    mutation.mutate({ librespotConcurrency: safe });
+  };
+
+  if (isLoading) return <p className="text-content-muted dark:text-content-muted-dark">Loading server settings...</p>;
+
+  return (
+    <form onSubmit={handleSubmit(onSubmit)} className="space-y-4">
+      <div className="flex items-center justify-end mb-2">
+        <div className="flex items-center gap-3">
+          <button
+            type="submit"
+            disabled={mutation.isPending || !isDirty}
+            className="px-4 py-2 bg-button-primary hover:bg-button-primary-hover text-button-primary-text rounded-md disabled:opacity-50"
+            title="Save Librespot Concurrency"
+          >
+            {mutation.isPending ? (
+              <img src="/spinner.svg" alt="Saving" className="w-5 h-5 animate-spin logo" />
+            ) : (
+              <img src="/save.svg" alt="Save" className="w-5 h-5 logo" />
+            )}
+          </button>
+        </div>
+      </div>
+
+      <div className="flex flex-col gap-2">
+        <label htmlFor="librespotConcurrency" className="text-content-primary dark:text-content-primary-dark">Librespot Concurrency</label>
+        <input
+          id="librespotConcurrency"
+          type="number"
+          min={1}
+          max={16}
+          step={1}
+          {...register("librespotConcurrency", { valueAsNumber: true })}
+          className="block w-full p-2 border bg-input-background dark:bg-input-background-dark border-input-border dark:border-input-border-dark rounded-md focus:outline-none focus:ring-2 focus:ring-input-focus"
+          placeholder="2"
+        />
+        <p className="text-xs text-content-secondary dark:text-content-secondary-dark">Controls worker threads used by the Librespot client. 1–16 is recommended.</p>
+      </div>
+    </form>
+  );
+}
+
 // --- Components ---
 function WebhookForm() {
   const queryClient = useQueryClient();
@@ -299,6 +370,12 @@ export function ServerTab() {
         <UtilityConcurrencyForm />
       </div>
       <hr className="border-border dark:border-border-dark" />
+      <div>
+        <h3 className="text-xl font-semibold text-content-primary dark:text-content-primary-dark">Librespot</h3>
+        <p className="text-sm text-content-muted dark:text-content-muted-dark mt-1">Adjust Librespot client worker threads.</p>
+        <LibrespotConcurrencyForm />
+      </div>
+      <hr className="border-border dark:border-border-dark" />
       <div>
         <h3 className="text-xl font-semibold text-content-primary dark:text-content-primary-dark">Webhooks</h3>
         <p className="text-sm text-content-muted dark:text-content-muted-dark mt-1">

spotizerr-ui/src/contexts/SettingsProvider.tsx

@@ -33,6 +33,7 @@ export type FlatAppSettings = {
 	deezerQuality: "MP3_128" | "MP3_320" | "FLAC";
 	maxConcurrentDownloads: number;
 	utilityConcurrency: number;
+	librespotConcurrency: number;
 	realTime: boolean;
 	fallback: boolean;
 	convertTo: "MP3" | "AAC" | "OGG" | "OPUS" | "FLAC" | "WAV" | "ALAC" | "";
@@ -74,6 +75,7 @@ const defaultSettings: FlatAppSettings = {
 	deezerQuality: "MP3_128",
 	maxConcurrentDownloads: 3,
 	utilityConcurrency: 1,
+	librespotConcurrency: 2,
 	realTime: false,
 	fallback: false,
 	convertTo: "",
@@ -138,6 +140,7 @@ const fetchSettings = async (): Promise<FlatAppSettings> => {
 			recursiveQuality: Boolean((camelData as any).recursiveQuality ?? false),
 			realTimeMultiplier: Number((camelData as any).realTimeMultiplier ?? 0),
 			utilityConcurrency: Number((camelData as any).utilityConcurrency ?? 1),
+			librespotConcurrency: Number((camelData as any).librespotConcurrency ?? 2),
 			// Ensure watch subkeys default if missing
 			watch: {
 				...(camelData.watch as any),

spotizerr-ui/src/contexts/settings-context.ts

@@ -9,6 +9,7 @@ export interface AppSettings {
   deezerQuality: "MP3_128" | "MP3_320" | "FLAC";
   maxConcurrentDownloads: number;
   utilityConcurrency: number;
+  librespotConcurrency: number;
   realTime: boolean;
   fallback: boolean;
   convertTo: "MP3" | "AAC" | "OGG" | "OPUS" | "FLAC" | "WAV" | "ALAC" | "";