optimize single video fetch

src-tauri/src/downloader.rs

@@ -76,6 +76,10 @@ pub async fn fetch_metadata(app: &AppHandle, url: &str, parse_mix_playlist: bool
        .arg("--flat-playlist")
        .arg("--no-warnings");
 
+    // Optimize metadata fetching: skip heavy manifests and player JS execution.
+    // Skipping JS prevents slow QuickJS spin-up and signature decryption, drastically speeding up single video parsing.
+    cmd.arg("--extractor-args").arg("youtube:skip=dash,hls,translated_subs;player_skip=js");
+
     if parse_mix_playlist {
         cmd.arg("--playlist-end").arg("20");
     }