ggml-org/llama.cpp b12101

on GitHub

ggml : write host-buffer tensor data directly in gguf writer (#31144)

The gguf writer staged each tensor into a temporary vector before
writing it. For host-buffer tensors the data pointer is directly
writable, so skip the staging copy and write it straight to the file.
This avoids the per-tensor allocation, zero-init and memcpy.

Assisted-by: dsh:llama.cpp/ggml-org/DeepSeek-V4-Flash-Vision-Exp-GGUF (Mac Studio, M2 Ultra, 192GB)