T3 Code first-word latency

Linux replay, Opus 5.5 / high / full access. Ten samples per version, AB/BA pairs. Submit to RPC: 149.3 to 100.5 ms, every pair faster by 33.7–63.9 ms. First-word paint proxy: 910.0 to 829.1 ms, but paired variability crosses zero, so no reliable total speedup is established.

Every paired change

Negative is faster. The total varies across zero; submit improves in every pair.

0.00.51.01.52.02.53.03.54.04.55.05.56.06.57.07.58.08.59.0Pair index, AB/BA order−250−200−150−100−50050100150msFirst-word paint proxy -79 msSubmit to RPC -63.9 ms2026-11-13; Linux Ryzen 7950X / 60 GiB, shared host; Opus 5.5 high; n=10 each; AB/BApairs. Total paired IQR crosses zero: no supported total speedup. Not official ADEMark.Negative is faster. First-word IQR crosses zero; submit improves in all pairs.Paired latency changes: candidate minus main

All phase samples

Independent phase medians do not sum to the total.

02004006008001,0001,200msMain 4aec277Patch 7511f5a910 ms829 ms -8.9%Enter to paint proxy050100150200msMain 4aec277Patch 7511f5a149 ms100 ms -33%Enter to composer RPC020406080100120msMain 4aec277Patch 7511f5a49.3 ms49.2 ms -0.2%RPC to worker050100150msMain 4aec277Patch 7511f5a102 ms108 ms +5.6%Worker to Claude adapter0100200300400500600msMain 4aec277Patch 7511f5a382 ms372 ms -2.7%Adapter to request024681012msMain 4aec277Patch 7511f5a6 ms5 ms -17%Request to first content frame050100150200msMain 4aec277Patch 7511f5a122 ms124 ms +1.5%First frame to browser marker020406080100msMain 4aec277Patch 7511f5a53 ms32.4 ms -39%Browser marker to paint02004006008001,000msMain 4aec277Patch 7511f5a683 ms642 ms -5.9%Enter to request0100200300400msMain 4aec277Patch 7511f5a288 ms285 ms -1.3%SDK initialization01234msMain 4aec277Patch 7511f5a0 ms0.5 msNative/logged first-frame timestamp gap2026-11-13; Linux Ryzen 7950X / 60 GiB, shared host; Opus 5.5 high; n=10 each; AB/BApairs. Total paired IQR crosses zero: no supported total speedup. Not official ADEMark.Paired replay: submit gain, total inconclusive
PhaseBeforeAfter
Enter → RPC149.3 [141.4, 157.2]100.5 [89.1, 113.9]
RPC → turn worker49.3 [44.1, 67.5]49.2 [41.1, 99.4]
Worker → adapter102.4 [86.5, 121.5]108.1 [84.3, 142.5]
Adapter → request382.2 [356.8, 461.5]372.0 [351.5, 428.7]
Request → content frame6.0 [5.0, 9.0]5.0 [4.0, 7.0]
Content → browser marker121.8 [115.2, 148.0]123.6 [116.8, 148.6]
Marker → paint proxy53.0 [23.1, 88.8]32.4 [21.7, 82.3]
Enter → request682.6 [656.6, 764.8]642.2 [596.5, 708.1]

Earlier sequential blocks

These complete runs show backend startup drift, not a reliable total improvement. They are retained for transparency.

05001,0001,500msMain sourceComposer source918 ms1,079 ms +18%Enter to paint proxy050100150200250msMain sourceComposer source172 ms133 ms -23%Enter to RPC0100200300400500msMain sourceComposer source272 ms364 ms +34%SDK initialization2026-11-13; same Linux host, Opus 5.5 high; n=10 each; sequential blocks. SDK driftoverwhelms submit gain. Not the paired confirmation; no supported total speedup.Sequential replay: backend startup drift

Input proxies

Four new-thread pairs and five typing pairs were slower on the candidate. These measurements establish neither regression nor reliable improvement.

0100200300msMain 4aec277Patch 7511f5a225 ms196 ms -13%New thread to focus/paint020406080100msMain 4aec277Patch 7511f5a54.8 ms42 ms -23%Typing to paint2026-11-13; Linux Ryzen 7950X / 60 GiB, shared host; Opus 5.5 high; n=10 each; AB/BApairs. Total paired IQR crosses zero: no supported total speedup. Not official ADEMark.New-thread: 4/10 candidate pairs slower; typing: 5/10 slower. No reliable changeclaimed.Browser input proxies, not ADEMark A1/A2

Synthetic Enter, DOM/two-frame paint and logged first-content proxies, shared Linux development host. This is not an official ADEMark score or macOS/M4 reproduction. Production composer source is unchanged from the measured version; test coverage was strengthened afterward. PostPlan uses fallback colors because the active client theme could not be read.

Exact method, scripts, chart inputs and all numeric samples