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Every ASR/TTS worker (faster-whisper, qwen3, vibevoice, xtts) kept every model it ever loaded resident in GPU memory forever, and switching to a different model (e.g. a different whisper size) just added another one alongside it rather than freeing the old one. Combined with the shared 24GB GPU, this made memory pressure only ever go up. Now: only one model stays resident per worker at a time (loading a different model_id evicts the previous one first), and the whole cache (plus, for faster-whisper, the diarization pipeline) is dropped after 2 minutes of no requests. Verified end-to-end: the idle timer actually fires and reclaims memory, and switching qwen3 models evicts the old one. Co-Authored-By: Claude Sonnet 5 <noreply@anthropic.com>