# Upgrade Flash Next to DFlash2 in llama.cpp for ~17% Speed Boost

- URL: https://spark.tlec.top/en/news/upgrade-flash-next-to-dflash2-6ac0e32f/
- Date: 2026-10-30
- category: tool
- source: https://www.reddit.com/r/LocalLLaMA/comments/1xjlgm4/psa_upgrade_flash_next_to_dflash2_if_you_havent
- sourceName: r/LocalLLaMA
- tags: llama.cpp, Qwen, DFlash2, Apple Silicon, GGUF

> With llama.cpp now supporting DFlash2 for Qwen3.8-Flash-Next, local decode speeds improve by an average of 17% while draft head size shrinks to ~350MB.

According to community tests, llama.cpp now supports DFlash2 for Qwen3.8-Flash-Next. Benchmarks on Apple Silicon (M5 Max) show:

- **Performance**: Geometric mean speed increased by ~17% compared to MTP. List prompts saw a 39% boost (from 91.4 tps to 127 tps), while prose experienced a minor -3% regression.
- **Optimal Parameters**: Found to be `n-max = 5`, `p-min = 0.75` for DFlash2.
- **Size Reduction**: The Q4_0 DFlash2 draft head is only ~350MB, significantly smaller than the 2.2GB GGML MTP head.
- **Vision Support**: Vision-enabled prompts work properly with coherent responses and good acceptance rates.

Source: https://www.reddit.com/r/LocalLLaMA/comments/1xjlgm4/psa_upgrade_flash_next_to_dflash2_if_you_havent