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Profiling the boot answered "is there a real cold-start win?": no wasteful hotspot — the renderer does only ~tens of ms of work at mount, no heavy library (shiki/mermaid/katex/d3/motion) initializes at startup; the rest is Electron runtime + waiting, near the Electron floor. It also exposed that the cold-start number was pessimistic: a fresh --user-data-dir per run means a COLD V8 code cache and worst-case bundle recompile every launch. Real users reuse their profile. Measured delta: fresh (cold cache): spawn→interactive ~1.48s reused (warm cache): ~1.0s So representative launch is ~1.0s; only first-launch-after-install pays ~+400ms. - coldStartSamples() reuses one profile (run 0 warms the cache, discarded; runs 1..N are warm samples), stepping ports + pausing so the single-instance lock releases. `--cold-fresh` measures the first-launch worst case. - Re-baselined cold-start with the representative warm numbers. Net: nothing high-ROI left to optimize. The only lever is shipping a pre-warmed V8 code cache to make first launch match warm (~400ms, once per update) — real packaging complexity for a marginal win, deliberately not pursued.
60 lines
1.7 KiB
JSON
60 lines
1.7 KiB
JSON
{
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"_meta": {
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"note": "Median of 5 runs, darwin-arm64, `--spawn --prod` (PRODUCTION minified renderer, real boot — no fake-boot). Representative shipped numbers, not dev-inflated. cold-start reuses one profile so the V8 code cache is WARM (what users get after first launch, ~1.0s); a fresh-profile first launch is ~+400ms (measure with `--cold-fresh`). Marks are process-spawn wall clock (spawn_to_*) or renderer nav-relative (dom_*). Re-baseline per device with `--update-baseline`; tolerances loose for cross-machine/disk variance.",
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"platform": "darwin-arm64",
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"node": "v24.11.0",
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"updated": "2026-07-19T23:16:01.227Z"
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},
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"scenarios": {
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"stream": {
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"tolerance": {
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"tolFrac": 0.6,
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"tolAbs": 5
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},
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"metrics": {
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"longtasks_n": 1,
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"longtask_max_ms": 67,
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"frame_p95_ms": 22,
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"frame_p99_ms": 23.7,
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"slow_frames_33": 1,
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"intermut_p95_ms": 36.1
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}
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},
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"keystroke": {
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"tolerance": {
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"tolFrac": 0.6,
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"tolAbs": 4
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},
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"metrics": {
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"keystroke_p50_ms": 2.1,
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"keystroke_p95_ms": 8.7,
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"keystroke_p99_ms": 16.9,
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"keystroke_slow_16": 2
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}
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},
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"transcript": {
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"tolerance": {
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"tolFrac": 0.75,
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"tolAbs": 40
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},
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"metrics": {
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"transcript_mount_ms": 145,
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"transcript_longtask_ms": 82,
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"transcript_longtask_max_ms": 82
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}
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},
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"cold-start": {
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"tolerance": {
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"tolFrac": 0.6,
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"tolAbs": 150
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},
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"metrics": {
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"spawn_to_cdp_ms": 606,
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"spawn_to_driver_ms": 984,
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"dom_interactive_ms": 324,
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"dom_content_loaded_ms": 574,
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"nav_to_read_ms": 721
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}
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}
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}
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}
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