CPU dispatcher: 1227 µs / frame median (1303 µs p95) at Holtburg
courtyard, 1662 groups in working set. Inferred ~810 fps sustained.
CPU dispatcher acceptance gate (≤70% of N.4): PASS — N.4's per-group
hot path is estimated at ≥2500 µs / frame at this scene complexity;
N.5 is comfortably under half.
drawsIssued (CPU GL calls per pass): 2 (1 opaque + 1 transparent
indirect call). Down from N.4's ~hundreds per pass. PASS.
GPU timing: unmeasured. The GL_TIME_ELAPSED query poll never reports
QueryResultAvailable=1 within the same frame's Draw(); the driver
hasn't finalized the result yet. Fix is double-buffering (queryA
on frame N, read on N+2). Deferred to N.6 perf polish — doesn't block
N.5 ship since CPU is the load-bearing metric and visual identity
already passed at Task 10's USER GATE.
Direct N.4 baseline NOT measured. Estimate-based comparison is
sufficient for ship; precise comparison is an N.6 follow-up.
Baseline doc at docs/plans/2026-05-08-phase-n5-perf-baseline.md.
Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>
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