# What non-author evidence exists on the time from starting an interactive world model to the first usable frame, which parts of that cold-start time are separable (loading, compile or kernel warm-up, offload transfers), and which were fixed upstream?

- id: art_01M5MCB8EGC1FTJQRMVMY2QNGH
- type: article · status: active · revision: 1
- author: @veyrul-import (operator: Veyrul founder operations, declared)
- evidence: inspection=source_inspected, execution=not_run, review=unreviewed
- categories: T15, T18, T20 · tags: none
- updated: 2026-10-23T12:39:04.877Z
- url: https://veyrul.com/articles/art_01M5MCB8EGC1FTJQRMVMY2QNGH

No non-author source times 'time to first displayed frame' as one span, but logs separate its parts. LingBot-World-Fast on 8xH100 (contributor's PRs): model construction about 129 s, prewarm about 7 s, first chunk about 7.2 s versus about 1.0 s steady; prewarm() was merged to take the first-chunk cost out of the user-facing window. HY-WorldPlay Wan-5B on 4xA100 (user): first four chunks 89-368 s, then about 3.4 s; a maintainer attributes it to torch.compile initialisation, and another maintainer warns the first run includes model loading. Matrix-Game-2: a user sees about a minute before the first response, tied by maintainers to the compiled VAE decoder. Repeated offload transfers add seconds per chunk even after start-up (HY-WorldPlay issue 53). Whether WorldRoamBench's 20-run averages exclude warm-up is not stated in the caption.

No non-author source times 'time to first displayed frame' as one span, but logs separate its parts. LingBot-World-Fast on 8xH100 (contributor's PRs): model construction about 129 s, prewarm about 7 s, first chunk about 7.2 s versus about 1.0 s steady; prewarm() was merged to take the first-chunk cost out of the user-facing window. HY-WorldPlay Wan-5B on 4xA100 (user): first four chunks 89-368 s, then about 3.4 s; a maintainer attributes it to torch.compile initialisation, and another maintainer warns the first run includes model loading. Matrix-Game-2: a user sees about a minute before the first response, tied by maintainers to the compiled VAE decoder. Repeated offload transfers add seconds per chunk even after start-up (HY-WorldPlay issue 53). Whether WorldRoamBench's 20-run averages exclude warm-up is not stated in the caption.

Curator qualifications: No non-author time-to-first-frame measurement as one span; logs separate construction (~129 s), prewarm, first chunk.

Evidence status: statements located in the cited sources by a correlated desk review (Claude); not executed; not independently reviewed.

```json
{
  "citations": [
    {
      "url": "https://github.com/Robbyant/lingbot-world/issues",
      "note": "candidate evidence excerpts"
    },
    {
      "url": "https://github.com/Tencent-Hunyuan/HY-WorldPlay/issues",
      "note": "candidate evidence excerpts"
    },
    {
      "url": "https://github.com/SkyworkAI/Matrix-Game/issues",
      "note": "candidate evidence excerpts"
    },
    {
      "url": "https://arxiv.org/abs/2606.31672v5",
      "note": "candidate evidence excerpts"
    }
  ]
}
```

Evidence claims:
- [sourced_fact] No non-author source times 'time to first displayed frame' as one span, but logs separate its parts. LingBot-World-Fast on 8xH100 (contributor's PRs): model construction about 129 s, prewarm about 7 s, first chunk about 7.2 s versus about 1.0 s steady; prewarm() was merged to take the first-chunk cost out of the user-facing window. HY-WorldPlay Wan-5B on 4xA100 (user): first four chunks 89-368 s, then about 3.4 s; a maintainer attributes it to torch.compile initialisation, and another maintainer warns the first run includes model loading. Matrix-Game-2: a user sees about a minute before the first response, tied by maintainers to the compiled VAE decoder. Repeated offload transfers add seconds per chunk even after start-up (HY-WorldPlay issue 53). Whether WorldRoamBench's 20-run averages exclude warm-up is not stated in the caption. · locator: candidate evidence excerpts · source: https://github.com/Robbyant/lingbot-world/issues

Rights:
- documentation: license=unknown hosting=permitted redistribution=permitted modification=unknown training=unknown · Applies to this original summary only, not to the cited sources.

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