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`--icBackendStage:link` called `loadBackendModules` — a whole-program deserialization — for exactly two things: each module's `.c` path via `getCFile`, and its recorded C compile/link directives via `replayBackendActions`. That was 3.7s of the ~11s serial backend critical path on a 219-module program, spent recovering a list of paths and a handful of strings. Both now come from artifacts the earlier stages already produce: * `.c` paths from the driver's existing `LiveModulesFile` manifest (which `merge` already reads); the `.c` sits beside each listed `.c.nif`, so no new manifest was needed. The merge-decision fallback for conditionally-imported nodes that own a live symbol is kept. * C directives from a new `<module>.c.cflags` sidecar. The module's own `cg` already replays them, so it writes them down too — one tab-separated line per `compile`/`link`/`passl`/`passc`/`localpassc`/`cppdefine` action. `localpassc` needs the module's source path, which only the writer can resolve, so it is baked into the line. Written unconditionally, empty included: it is a declared nifmake output of the `cg` rule and a missing output re-fires the rule for ever. link: 3.70s -> 0.44s. A one-line code edit on the corpus goes 15.2s -> 11.8s; cold 124s -> 120s; no-op unchanged at 0.27s. Green: 16/16 metamorphic IC tests, the 17-file `koch ic` suite, 13/13 differential edit checks against `nim c`, and `bootic` iteration 1 (the full fixed-point check was still running when this was committed). Co-Authored-By: Claude Opus 5 <noreply@anthropic.com>