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Worker prompts drop everything downstream of DistributedCollector / UltimateSDUpscaleDistributed, so the master re-added a PreviewImage (or PreviewAudio) to give ComfyUI an output node. That preview wrote every result frame as a PNG into the worker's temp directory: for a 362-frame 1344x768 video, ~2 GB per run (RAM when temp is on tmpfs) plus CPU time spent PNG-encoding frames nobody looks at. - Add DistributedWorkerSink: an output node that discards its input. It is is_dev_only, so it stays out of node search and menus. - The master probes each worker with GET /object_info/DistributedWorkerSink while preparing its prompt and uses the sink when it is registered. Workers on older versions (or a failed probe) keep the PreviewImage / PreviewAudio terminator, so mixed versions keep working. Verified with a real master plus one updated and one old worker: the updated worker ran EmptyImage -> Collector -> Sink and left its temp directory empty; the old worker still received PreviewImage. Claude-Session: https://claude.ai/code/session_0166t8T3CVaxZkJbP2RtSpo6 Co-authored-by: ymiyad <cab-13-might@icloud.com> Co-authored-by: Claude Opus 5.5 <noreply@anthropic.com>