Update draft-head speed tables (v0.8.0)

README.md

@@ -181,19 +181,24 @@ alone. It is off unless asked for:
 GBX_GLM53_MTP=on gbx_lm --model GreenBitAI/GLM-5.3-Flash-4bit-paged
 ```
 
-**It grows with the context.** Measured 2026-09-18 on a 512 GB Mac Studio
-(M3 Ultra), greedy, decode timed from the first token, both columns from the same
-build:
-
-| context | head off | head on | speedup | accepted |
-|---|---|---|---|---|
-| 11,317 | 27.1 tok/s | **38.3** | **1.41x** | 78% |
-| 2,854 | 27.5 | **35.7** | 1.30x | 76% |
-| 715 | 31.6 | 31.8 | 1.01x | 65% |
-
-A short context has little to go on, so the head proposes less well and the win
-is small; by 11k it accepts 78% of what it proposes. Through the server on
-chat-shaped questions it accepts 63-75%.
-
-Every token the head proposes is verified by the model itself, so the reply is
-the model's own either way; the head only saves passes over the weights.
+**Up to 1.4x, more as the context grows.**
+Measured 2026-10-13 with `gbx_lm` v0.8.0 on a 512 GB Mac Studio (M3 Ultra), weights
+resident, greedy, thinking off, 256 tokens a reply, decode timed from the first token.
+Short prompts: three each of code, prose and chat, three runs each, the median per kind.
+Long contexts: a slice of source code and a question about it, the median of three runs.
+
+| prompt | head off | head on | speedup |
+|---|---|---|---|
+| short, code | 39.5 tok/s | **55.5** | 1.41x |
+| short, prose | 39.5 | **45.8** | 1.16x |
+| short, chat | 39.5 | **50.8** | 1.29x |
+| 3,400-token context | 32.6 | **40.0** | 1.23x |
+| 14,000-token context | 32.2 | **43.8** | 1.36x |
+| 29,000-token context | 31.4 | **42.5** | 1.35x |
+
+Code gains most and prose least. With more context behind it the head proposes
+better -- it accepts about 63% of what it proposes on short prompts and 75-77%
+from 14k tokens on.
+
+Every token the head proposes is checked by the model itself, so the reply is the
+model's own either way; the head only saves passes over the weights.