ComfyUI v0.37.0 slowdown: same workflow jumps from 5 minutes to 3 hours
siegekeebsofficial · reddit · 2026-09-28
A user reports a severe performance regression in ComfyUI v0.37.0:
- On v0.30.0, a workflow with H3 and Ideogram 4.0 generated a clip in about 5 minutes
- After upgrading to v0.37.0, the exact same settings, workflow and models now show an estimated 3-hour runtime after 20 minutes of processing
The report serves as a heads-up for anyone relying on ComfyUI for heavy video generation — consider holding off on the upgrade or benchmarking before committing.
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