Generating 45-second videos in ~415s on a single RTX 5080 with chained FastH3 nodes
Hrmerder · reddit · 2026-09-18
A Reddit user published a full workflow (on Civitai) for chaining FastH3 nodes to generate 45-second videos on a single RTX 5080 with 64GB RAM.
Key points
- One prompt feeds Z Image Turbo for the first frame, then 3 FastH3 instances continue the video
- Per-segment duration 1–15s, chaining yields 3–45s outputs
- Measured 415.6s to render 45 seconds of video
- First run is slow; subsequent runs are much faster even with new seeds/prompts
- Incrementing the seed per segment keeps shots roughly consistent, though zooms break adherence
Example videos and the complete workflow are linked in the post.
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