- the perf pill is ~25 quads on the player-UI pass — `{fps} fps {cpu} ms` and nothing else — so the egui lane sleeps whenever no dev panel is open, instead of the collapsed pill paying ~1 ms for egui's whole per-frame train
- the pill is the whole HUD: the expanded readout, the spike arrow and the spike-detection engine behind it are removed; a >250 ms hitch still logs
- WOW_CPU_CENSUS=<at>:<secs> — a per-thread CPU census that sums to the process total exactly, user/sys split; in Lower Blackrock Spire the main thread is ~41% of ~14.5 ms, the render thread ~17%, the compute pool ~25%, Metal's own workers ~12%
- the object field store goes flat: the wire's presence mask plus a dense value array replace a BTreeMap, so 5–10k descriptor probes a frame are two array indexings — the main thread ~0.5 ms/frame lighter at the same pin
Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>
