mirror of
https://github.com/legop3/MultiRoombaRover.git
synced 2026-09-16 09:31:20 -04:00
187 lines
4.1 KiB
Markdown
187 lines
4.1 KiB
Markdown
# `/` Performance Investigation Summary
|
|
|
|
This is the high-level handoff for the default route at:
|
|
|
|
```sh
|
|
https://rover.otter.land/
|
|
```
|
|
|
|
The detailed issue writeups live in `perf/issues/`.
|
|
|
|
## Main Finding
|
|
|
|
The `/` page is doing too much main-thread work for low-end devices. On the current powerful
|
|
machine it can appear smooth, but CPU throttling shows real risk for mobile and weaker
|
|
computers.
|
|
|
|
The biggest measured problem is repeated global input listener churn. The broader underlying
|
|
theme is that high-frequency live data and broad React context invalidation cause many parts
|
|
of the page to rerender or recommit DOM attributes.
|
|
|
|
## Key Measurements
|
|
|
|
### Clean `/` Profile, 8x Mobile CPU Throttle
|
|
|
|
Artifact:
|
|
|
|
```sh
|
|
perf/results/2026-06-11T03-15-51-398Z/report.json
|
|
```
|
|
|
|
Results:
|
|
|
|
```txt
|
|
average frame interval: ~140ms
|
|
p95 frame interval: ~166.8ms
|
|
p99 frame interval: ~383.4ms
|
|
long tasks: 67
|
|
event listener delta: +13,481
|
|
JS heap delta: +22.76MB
|
|
ScriptDuration delta: ~35.85s
|
|
TaskDuration delta: ~52.88s
|
|
```
|
|
|
|
Top notable CPU self-time included:
|
|
|
|
```txt
|
|
removeEventListener ~1.30s
|
|
addEventListener ~0.94s
|
|
```
|
|
|
|
### Listener Audit
|
|
|
|
Artifact:
|
|
|
|
```sh
|
|
perf/results/2026-06-11T03-03-31-625Z-listeners/listener-report.json
|
|
```
|
|
|
|
Worst churn:
|
|
|
|
```txt
|
|
keydown adds=8040 removes=8039
|
|
keyup adds=8040 removes=8039
|
|
blur adds=8040 removes=8039
|
|
gamepadconnected adds=8040 removes=8039
|
|
gamepaddisconnected adds=8040 removes=8039
|
|
```
|
|
|
|
### `/` Runtime Audit, 6x Mobile CPU Throttle, 30s
|
|
|
|
Artifact:
|
|
|
|
```sh
|
|
perf/results/2026-06-11T03-21-51-263Z-root-runtime/root-runtime-report.json
|
|
```
|
|
|
|
Results:
|
|
|
|
```txt
|
|
average frame interval: ~88ms
|
|
p95 frame interval: 150ms
|
|
p99 frame interval: 183ms
|
|
long tasks: 18
|
|
WebSocket messages: at least 1000 sampled
|
|
WebSocket bytes: ~798KB sampled
|
|
DOM mutation records: 41,062
|
|
DOM attribute records: 40,761
|
|
```
|
|
|
|
Top sampled WebSocket events:
|
|
|
|
```txt
|
|
log:entry 526
|
|
sensorFrame 306
|
|
commandAck 145
|
|
session:sync 5
|
|
```
|
|
|
|
### `/` Runtime Audit With Mutation Targets, 6x Mobile CPU Throttle, 18s
|
|
|
|
Artifact:
|
|
|
|
```sh
|
|
perf/results/2026-06-11T03-22-44-714Z-root-runtime/root-runtime-report.json
|
|
```
|
|
|
|
Results:
|
|
|
|
```txt
|
|
average frame interval: ~116.6ms
|
|
p95 frame interval: ~166.7ms
|
|
p99 frame interval: ~316.6ms
|
|
long tasks: 16
|
|
DOM mutation records: 18,758
|
|
DOM attribute records: 18,490
|
|
```
|
|
|
|
Top WebSocket events:
|
|
|
|
```txt
|
|
log:entry 850
|
|
sensorFrame 277
|
|
commandAck 200
|
|
session:sync 23
|
|
```
|
|
|
|
Top mutation targets:
|
|
|
|
```txt
|
|
input.accent-emerald-400 name 5300
|
|
input.accent-emerald-400 type 2650
|
|
field-input name ~1300 each
|
|
div.h-full style 1238
|
|
path d 621
|
|
path fill 619
|
|
```
|
|
|
|
## Ordered Work Plan
|
|
|
|
1. Fix `KeyboardInputManager` and `GamepadInputManager` listener churn.
|
|
2. Split/stabilize `ControlContext` so action consumers do not rerender on every state change.
|
|
3. Batch or gate `log:entry` socket updates.
|
|
4. Throttle visual telemetry rendering.
|
|
5. Memoize or lazy-mount `ReplaySourcesPanel`.
|
|
6. Split and memoize chat composer/nickname form.
|
|
7. Clean up or share timers.
|
|
|
|
## Reproduction Commands
|
|
|
|
Install Playwright dependency if missing:
|
|
|
|
```sh
|
|
npm install --prefix perf playwright@1.60.0
|
|
npx playwright install chromium
|
|
```
|
|
|
|
Clean CPU profile:
|
|
|
|
```sh
|
|
CPU_THROTTLE=8 VIEWPORT=390x844 MOBILE=1 node perf/live-cpu-profile.mjs https://rover.otter.land/ perf/results
|
|
```
|
|
|
|
Listener audit:
|
|
|
|
```sh
|
|
node perf/live-listener-audit.mjs https://rover.otter.land/ perf/results
|
|
```
|
|
|
|
Runtime audit:
|
|
|
|
```sh
|
|
CPU_THROTTLE=6 VIEWPORT=390x844 MOBILE=1 SAMPLE_MS=30000 node perf/live-root-runtime-audit.mjs https://rover.otter.land/ perf/results
|
|
```
|
|
|
|
Runtime audit with shorter mutation target sample:
|
|
|
|
```sh
|
|
CPU_THROTTLE=6 VIEWPORT=390x844 MOBILE=1 SAMPLE_MS=18000 node perf/live-root-runtime-audit.mjs https://rover.otter.land/ perf/results
|
|
```
|
|
|
|
## Notes
|
|
|
|
The `perf/results/2026-06-11T03-11-39-596Z-route-sweep/` route sweep includes `/spectate`,
|
|
`/mini`, `/display`, and `/scanner`. Those are not the current priority. Use them only for
|
|
context.
|
|
|