When the Runware CDN download was slow (~10-20s over VPN / strict
networks, vs. the optimistic <2s the existing comment assumed), the
preload's 8s timeout fired and setImageUrl committed before the bytes
were actually decoded. The rendered <img> has w-auto h-auto and no
intrinsic aspect-ratio source — until the image loads the layout
collapses to roughly 1px tall, giving the "等了很久 → 一根线 → 突然
出图" jank.
Two compounding fixes:
app/play/page.tsx IMAGE_PRELOAD_TIMEOUT_MS 8000 → 20000.
Real CDN+decode usually finishes well before
this; pushing the ceiling out just stops the
window where we commit a half-loaded URL.
components/PlayCanvas.tsx Add width={1792} height={1024} HTML attrs
to the scene <img>. Doesn't affect rendered
size (still driven by w-auto h-auto and the
maxWidth/maxHeight in sizeStyle); the
browser uses them purely as an intrinsic
aspect-ratio source, so the placeholder box
reserves a 16:9-ish frame even mid-download.
Together: slow networks now mostly wait through preload; on the rare
genuine timeout the layout still holds shape instead of collapsing.
Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>
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