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https://github.com/willmiao/ComfyUI-Lora-Manager.git
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d324b57274
Root cause: 231 concurrent /check-model-exists requests on 175K-lora library caused ~9.4s wall clock time. The bottleneck was two-fold: 1. DownloadedVersionHistoryService opened a new sqlite3.connect() for every query under asyncio.Lock. With a large WAL from 175K entries, each connect() took ~8ms. Serialized by the lock across 231 requests, the 230th request waited ~1848ms just for lock acquisition. 2. check_model_exists always queried download history even when the model was found locally. The history result (hasBeenDownloaded / downloadedVersionIds) is only used by the UI when the model is NOT found locally; when found, the 'in library' indicator takes priority. Changes: - downloaded_version_history_service.py: added persistent _get_conn() that creates the SQLite connection once and reuses it across all queries - misc_handlers.py: early-return from check_model_exists when the model exists locally, bypassing the history service entirely (lock skipped) Expected: per-request wait time drops from ~1912ms to <3ms, wall clock from ~9.4s to <0.3s for the 175K-lora user's 231-card page.