Local LLM on Mac: M2 Ultra 192GB Long-Context Inference Benchmarks
Badger-Purple · reddit · 2026-08-02
A developer tested the local inference performance of a large model (Deepseek-V4-Flash-0731 Dwarfstar) on an M2 Ultra machine with 192GB of unified memory.
Performance Data:
- Prefill phase: Strong performance (see attached chart)
- Decode phase: Starts at 28 t/s; drops to 25 t/s at 45k context length; maintains 17 t/s even at the 192k limit.
Related event: DeepSeek V4 Flash Sparks a Wave of Local Deployment Tests(26 posts)→
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