First inference triggers Triton/TileLang kernel JIT compilation (2-3 min). The default 5-min RPC timeout kills the engine. Bumped to 10 min via VLLM_RPC_TIMEOUT_MS so the first request survives compilation. Not ideal — would prefer to warm up the kernels during startup. But CUDA graphs don't work well with grouped GEMMs and variable expert counts. Will investigate vLLM warmup shape config later.
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