TAR PREVIEW: REAL APP COMPARISON

Base: 2bee33eb193a0430c9a0d8e24f8f684163f045a4
Head: 6eb80309a1f8c199c027d09095cc398ad894e16a

Linux x86_64 | Chromium 156.0.8078.4 | 1280x800 | dark
Five fresh browsers per archive per commit. Synthetic data only.

Metric                               Base              Head
----------------------------------------------------------------------------
Mixed backing storage (bytes)        42,438,440.000       495,896.000
Worker parse median (ms)                     15.600             0.900
Worker parse spread (ms)                     10.900             0.200
Click-to-listing median (ms)                909.600           865.025

BASE
Control backing storage: 495,400 bytes
Mixed minus control: 41,943,040 bytes
backingStorageSize: 42,438,440.000, 42,438,440.000, 42,438,440.000, 42,438,440.000, 42,438,440.000
parseMs: 25.600, 18.100, 15.600, 15.200, 14.700
uiOpenMs: 878.427, 955.879, 930.336, 909.600, 899.491

HEAD
Control backing storage: 495,896 bytes
Mixed minus control: 0 bytes
backingStorageSize: 495,896.000, 495,896.000, 495,896.000, 495,896.000, 495,896.000
parseMs: 1.000, 0.900, 0.900, 0.800, 0.800
uiOpenMs: 879.602, 864.692, 851.192, 865.025, 873.572

Memory spread: 0 bytes for mixed and control on both commits.
All 20 runs: four entries, correct sizes, after.txt renders "after".
All 10 mixed runs: existing 10 MB preview-limit error.

Worker parse median improvement: 14.7 ms; combined spreads: 11.1 ms.
Click-to-listing ranges overlap: no end-to-end speedup established.

Separate oversized-slice attribution probe: base 41,943,040 bytes; head 0.
The slice probe is separate from the five-run timing measurements.