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A start that finds the pipeline cache written by another device or driver has nothing built, and everything was compiled beside the game: an 8-core integrated GPU drew fewer than 600 frames in its first 11 minutes. Such a start now waits on the "Preparing shaders" screen, with counts, for every recorded pipeline, for the compute pipelines on every core at normal priority, and, when a sample says the driver's own cache lacks the prepared stage libraries, for all of them on every core. The memory gate still holds for the builds, and the library builds write the preparation's journal while the start waits, so a variant the driver's compiler dies on is skipped from the next start on. boot-warm-owed.txt beside the caches names the GPU and driver: a start closed during the warm is followed by one that goes on with it, three at most, and "done" keeps later starts ordinary while the cache file still carries the earlier driver's header. When the boot stops waiting (prewarm_wait_ms, or a minute without progress) the builders step down to the background's thread counts and idle priority. prewarm_full = 0 turns the warm off. With nothing in the driver's cache the probe took 425 s on an RTX 5090 with 16 CPU threads: 87 s for 5,775 recorded pipelines, 19 s for 4,075 compute pipelines and 317 s for 42,231 prepared variants. Co-Authored-By: Claude Fable 5.2 <noreply@anthropic.com>