docs(readme): refresh performance tables for v0.3.0 - #300
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Update the decode throughput tables (M1 Ultra + M5 Max, text and VLM) to the 2026-06-15 sweep and recompute the prefill/decode aggregate summaries against the retained mlx-lm / mlx-vlm campaign reference, which a fresh same-host run confirmed is stable. The #289 bf16-scale decode fix shows up here (e.g. Qwen3 MoE 30B M5 156->176, Gemma 4 26B-A4B M5 137->151). Correct the M1 Ultra VLM prefill figure: the prior 1.33x was a non-reproducible 2026-05-19 sweep anomaly (confirmed by rebuilding v0.0.28 / v0.1.0; see #299) and is actually ~parity with mlx-vlm. Add a DiffusionGemma 26B-A4B block-diffusion mini-table (M1 Ultra: mlxcel 32 tok/s vs mlx-vlm 29 tok/s, 110%).
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Summary
Refreshes the README Performance section to the v0.3.0 (2026-06-15) sweep, text and VLM.
Methodology
mlxcel columns are the 2026-06-15 sweep; the mlx-lm/mlx-vlm reference columns are retained from the earlier same-host campaign (validated stable by a fresh run), so each ratio is mlxcel(2026-06-15) over that retained reference. M5 columns stay on the campaign reference (no M5 host available for a fresh run).
Validation