Hosting Local LLMs on Mac for Multiple Users: Concurrency Bottlenecks and Workarounds
Spanky2k · reddit · 2026-08-04
The author shares experience deploying local LLMs for multiple users on a 64GB M1 Ultra Mac Studio. The current LM Studio + open-webui stack faces bottlenecks, as concurrent users trigger redundant processing of historical prompts.
While vLLM is the standard, the author notes its poor support for Mac MLX models, with alternatives like vllm-metal still immature. To optimize, the author plans to downshift Qwen 3.6 from 8-bit to 4-bit, maximizing context window to 262,144 tokens and improving speed to better handle 2-3 concurrent users.
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