3.7 KiB
Compose bench v2 report from Iris's phone, 2026-09-06
Bench v2 (fling / stream / type / keyboard, RUST.md's P0 box) on the
Compose bench build, run by Iris on her Pixel 9 Pro XL, verbatim. Note
the display was at 60 Hz for this run (16.7 ms budget) where the v1
run was at 120 Hz -- the phone's adaptive refresh rate decides, and
late is judged against whichever it was, so compare a run with a run at
the same rate. The iris v2 report goes beside this when it exists.
What it says: fling, type and keyboard are all essentially clean on
Compose (0.1%, 0.9% and 0% late; fling p50 5.5 ms, p99 11.6 ms). The
whole tail is the streaming phase again -- 41.9% late, p99 42.5 ms,
driven by markdown reparsed while streaming (8.6 ms mean, 30.3 ms
worst) and record: one block (6.3 ms mean, 25.5 ms worst). Process CPU
69.6 s over the 125.5 s run; peak RSS 577 MB; battery current mean
571 mA over 126 samples.
ai-app render report
device: Pixel 9 Pro XL (Google), Android 17
build: release
transcript:
108 events, 26 rows, 58 units loaded
viewport 1531px, 2 units visible
on screen: the list's own 0px, AssistantMsg 24520px
0 tool calls and 0 groups open
per phase:
fling: 3278 frames over 32.7s
late: 4 (0.1%)
total p50 5.5ms p90 8.7ms p99 11.6ms
worst 49.0ms
stream: 1041 frames over 21.3s
late: 436 (41.9%)
total p50 13.4ms p90 31.7ms p99 42.5ms
worst 52.5ms
type: 2446 frames over 61.5s
late: 23 (0.9%)
total p50 7.3ms p90 13.2ms p99 16.5ms
worst 38.9ms
keyboard: 358 frames over 10.0s
late: 0 (0.0%)
total p50 6.3ms p90 8.6ms p99 11.1ms
worst 12.0ms
frames:
7122 frames over 125.5s at 60Hz (16.7ms budget)
late: 463 (6.5%)
total p50 6.0ms p90 13.8ms p99 34.0ms
waited p50 0.5ms p90 1.1ms p99 19.9ms
input p50 0.0ms p90 0.0ms p99 0.0ms
anim p50 0.7ms p90 4.5ms p99 7.6ms
layout p50 0.1ms p90 0.1ms p99 0.2ms
draw p50 0.7ms p90 2.9ms p99 21.9ms
sync p50 0.1ms p90 0.2ms p99 0.6ms
issue p50 1.4ms p90 2.4ms p99 3.2ms
swap p50 0.4ms p90 0.8ms p99 1.2ms
gpu p50 1.5ms p90 2.1ms p99 6.6ms
where the draw phase went:
draw phase 1.74ms per frame, of which:
the transcript: 0.24ms (measure 0.10, place 0.14, record 0.00)
everything else: 1.51ms (86%)
work since this was last copied:
draw: the whole transcript: 280, 1.9ms total, 0.0ms mean, 0.0ms worst
grouped tool runs: 407, 18.6ms total, 0.0ms mean, 0.2ms worst
markdown cut into pieces: 40, 0.4ms total, 0.0ms mean, 0.0ms worst
markdown parsed while composing: 2, 1.6ms total, 0.8ms mean, 1.1ms worst
markdown ready: 323
markdown reparsed while streaming: 395, 3406.9ms total, 8.6ms mean, 30.3ms worst
markdown warmed: 40, 38.2ms total, 1.0ms mean, 4.3ms worst
measure: the whole transcript: 1978, 683.9ms total, 0.3ms mean, 15.9ms worst
message composed: 397
message cut into parts: 40, 2.9ms total, 0.1ms mean, 0.2ms worst
place: the whole transcript: 4308, 996.0ms total, 0.2ms mean, 2.4ms worst
record: one block: 394, 2472.7ms total, 6.3ms mean, 25.5ms worst
session screen recomposed: 1630
status row recomposed: 1
transcript page from server: 10
unit composed: 927
units flattened: 408, 85.5ms total, 0.2ms mean, 1.8ms worst
bench:
fling: 8 flings out + 8 back at 12000px/s, travel start=idx=0/off=0px outward=idx=188/off=182px end=idx=0/off=0px
scroll: 6 cycles (24 swipes, legacy tween), streamed 400/400 fixture events
type: 600 characters inserted then deleted, one per 50ms
keyboard: shown 5/5, hidden 5/5 (confirmed via isImeVisible)
process CPU time over this run: 69564ms
peak RSS: 577452kB
battery current: mean -571483µA over 126 samples (min -2361718, max -99218)