Block drafters using all-parallel conditioning hit a fundamental information floor of 28.6% rejection at the final slot on Qwen3-4B, limiting maximum per-slot acceptance to 71%

the all-parallel floor reaches $0.286$ at the final slot on Qwen3-4B, limiting even the best proposal to $71\%$ per-slot acceptance

http://arxiv.org/abs/2608.27339v1