ik_llama.cpp Fork Delivers 26x Faster Prompt Processing on Qwen 3.5 27B on Blackwell RTX PRO 4000

r/LocalLLaMA·medium signal

A 157-upvote r/LocalLLaMA post with 60 comments shares real-world benchmark numbers comparing mainline llama.cpp vs the ik_llama.cpp fork on a Blackwell RTX PRO 4000 (24GB) running Qwen 3.5 27B Q4_K_M. The fork delivers 26x faster prompt processing in agentic coding workflows where long context prefill is the bottleneck. The author ran this as a daily driver for agentic coding before switching.