9 optimizations: single-copy weight sync, graph update vs re-capture, async validation, aux GEMM fusion, conditional frequency, target sync, mega-graph, batch_size 16K, validation subsampling. 50 trials × 40 epochs: 26hr → 10.6hr ($45/run savings at $3/hr) Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>