primeSceneForLoader() compiled scene materials and rendered the shadow/reflection passes
once, but never ran the full composer pipeline — so the SSAO and output passes compiled
their programs and allocated their render targets on the first live frame after the loader
faded, tanking FPS for ~1-2s before it climbed to full.
Now the loader runs composer.render() twice during prime, and precompiles the flip page
materials (created lazily on first flip, so previously missed by renderer.compile) via a
throwaway probe mesh. The heavy first-frame work is paid behind the loader overlay instead.
Verified live: loader timings show composerWarmup taking ~1499ms during load (exactly the
cost that used to hit the first frame); after fade-out there are no over-budget tank frames
in the slow-frame log and idle settles at ~72fps. Static suite passes (165).
Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>
Georg
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