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docs: add decode speed table with context scaling to README

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Decode at 87-91% of q8_0 for typical context, 70% at 48K (PDF test).
Prefill remains at 99% parity.

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>
Co-Authored-By: tturney@psyguard.ai
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TheTomClaude Opus 4.6
 committed 2026-03-25 22:43:51 -05:00
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@@ -41,7 +41,17 @@ Compresses transformer KV cache **4.6x** using PolarQuant + Walsh-Hadamard rotat
| 16K | 1737 | 1757 | 0.989x |
| 32K | 1211 | 1217 | 0.995x |
**Flat 99% of q8_0 speed regardless of context length.** See [Context Scaling Deep Dive](docs/context-scaling-deep-dive.md) for the full investigation.
**Prefill: flat 99% of q8_0 speed regardless of context length.**
### Decode Speed (Server, Real-World)
| Context | turbo3 decode | q8_0 decode | turbo3/q8_0 |
|---------|-------------|-----------|-------------|
| Short (~12 tok) | 77.2 | 85.2 | 0.91x |
| 8K | 67.3 | 77.7 | 0.87x |
| 48K (70-page PDF) | 39.0 | 55.6 | 0.70x |
Decode is 87-91% of q8_0 at typical context. At very long context (48K+) it's 70% due to per-position dequant cost. See [Context Scaling Deep Dive](docs/context-scaling-deep-dive.md) and [Decode Speed Investigation](docs/experiment-decode-speed.md).
### Speed Optimization Journey