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Every shader cache key names the translator, so a release with a new translator had no cached translation at all: the launcher re-translated about 42,000 programs before play, and play waited for any program not prepared. The cache now lists the translator identities it holds translations of in shader-cache/identities.txt, newest first. A shader the current translator has no translation of uses a previous one's, looked up with that identity mixed with this machine's host options and read with the usual checks; it keeps that translation for the rest of the session, so no pipeline is built twice. After the boot prewarm a background pass translates every stored input that has a previous translator's entry again under the current one, on its own translator child at idle priority that waits while the game translates. A program the new translator refuses keeps its old translation and is logged. Once the pass has gone through every such input, the old entries of what it covered are dropped: loose files are deleted, and a pruned copy of shader-cache.pack replaces the pack at the next start when the pack is still the one it was copied from. --prepare-shaders still translates everything under the current translator. NX2NAVI_SHADER_CARRY=0 keeps the earlier behaviour. Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>