Speculative decoding already beats autoregressive generation — but it still has a sequential bottleneck: verification must finish before drafting restarts. Saguaro (Speculative Speculative Decoding) breaks that dependency by pre-speculating for likely verification outcomes in parallel. Cache hit: return immediately. Cache miss: fall back cleanly. Up to 2x faster than optimized SD, 5x over autoregressive. Lossless by design.
