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Changing quantization from q4_k_m to q4_k_xl in llama.cpp doubles inference speed on the same GPU without hardware or driver changes, as demonstrated with Gemma 4 12B on an RTX 4060.
A detailed account of running the Qwen3.6-35B-A3B MoE model on an 8GB laptop GPU, covering effective optimizations like --no-mmap and VRAM headroom, unexpected findings where speculative decoding improved speed by 26% contrary to benchmarks, and pitfalls with Windows and CPU bottlenecks.