| Case | Configuration | Warm samples | Warm median (s) | Peak MLX GiB | SSIM | Exact pixels |
|---|---|---:|---:|---:|---:|---|
| product | BF16 baseline (packing still active) | 1 | 80.67 | 38.29 | 1.000000 | yes |
| product | Exact optimized BF16, final quiet session | 2 | 67.30 | 38.03 | 1.000000 | yes |
| product | Exact optimized packed BF16, final quiet session | 1 | 72.23 | 29.90 | 1.000000 | yes |
| product | BF16 baseline | 2 | 78.21 | 38.31 | 1.000000 | yes |
| product | Compiled BF16, retained refiners | 2 | 65.34 | 39.52 | 1.000000 | yes |
| product | Lossless packed, retained refiners | 1 | 70.62 | 31.38 | 1.000000 | yes |
| product | Compiled BF16 + exact caches + prefetch | 1 | 68.04 | 38.08 | 1.000000 | yes |
| product | Lossless packed + exact caches + prefetch | 1 | 73.86 | 29.90 | 1.000000 | yes |
| product | FP16 projection failure (non-finite) | 0 | invalid | 37.58 | invalid state | non-finite |
| product | Five original passes (skip head 1) | 0 | — | 37.35 | 0.796451 | no |
| portrait | BF16 baseline | 3 | 72.06 | 38.30 | 1.000000 | yes |
| portrait | Compiled BF16, retained refiners | 3 | 67.38 | 39.59 | 1.000000 | yes |
| portrait | Lossless packed, retained refiners | 2 | 73.56 | 31.38 | 1.000000 | yes |
| portrait | Compiled BF16 + exact caches + prefetch | 2 | 69.54 | 38.22 | 1.000000 | yes |
| portrait | Lossless packed + exact caches + prefetch | 2 | 74.44 | 29.90 | 1.000000 | yes |
| portrait | FP16 projection failure (non-finite) | 1 | invalid | 38.33 | invalid state | non-finite |
| portrait | Five original passes (skip head 1) | 1 | 68.43 | 38.09 | 0.694111 | no |
| native-4k | Lossless packed + exact caches + prefetch | 0 | — | 31.20 | 1.000000 | yes |