Stop busting caches and waiting around

[jessfraz]

Stop rebuilding models to open Settings, change scene preferences, or enter a sketch. Rust owns the active file and cache. Sketch operations reuse the loaded runtime; lint keeps context creation and Wasm restart calls in their lifecycle owners. Artificial waits and animations over 100 ms are blocked, and all new perf cases run in CI with a hard 150 ms budget.

Real-engine Rust and unmocked Playwright regressions cover unchanged sketch handoffs, invalid execution owners, file switching, reconnect, and actual Wasm crash recovery. The panic hook is compiled only into an isolated test build, never the normal app.

The backface regression is still red against the deployed engine: it caches the old material color. The engine fix is separate: KittyCAD/engine#5348, not another cache bust.

Hard-coded timings (before)

Interaction	Timing in code
Orientation cube	500 ms camera tween
Enter sketch	600 ms camera wait; 100 ms even with reduced motion
Viewport dimming	300 ms
Settings / Telemetry	Backdrop: 300 ms in, 75 ms out; panel: 75 ms in, 200 ms out. Route close unmounts immediately, so declared leave effects do not run.
Convert to Variable	300 ms in, 200 ms out. Current modal unmount cuts off leave effects; library defaults are not applied by React.
Browser desktop handoff	300 ms in, 200 ms out
Toasts	350 ms in, 400 ms out; 230 ms stack move; success icon 400 ms, custom icon 420 ms
Zookeeper text	500 ms delay + 1,500 ms (1.5 s) fade = 2,000 ms (2 s)
Code badge hover	200 ms
Shared tooltip	200 ms CSS default delay; 150 ms transform, 110 ms opacity; Feature Tree requests 500 ms. Native popover can show immediately without those enter effects.
Rich toolbar tooltip	1,000 ms (1 s) reveal delay; 500 ms hidden-content reset
Exchange / prompt cards	500 ms height transition
Command palette / Publish dialog	100 ms in, 75 ms out
Project / user / sign-in menus	100 ms in
File / project explorer	100–150 ms
Other decorative UI	75 ms project opacity; 80 ms toggle; 150 ms progress/Zoodle/default transitions
Code auto-execution	1,000 ms (1 s) debounce, before execution
Physical-analysis density / folder drag hover	400 ms debounce / hover wait
Geometry-to-code hover / trailing resize	250 ms; resize waits only on its throttled path, not every resize
Default-plane visibility	200 ms event deferral

Results (before → animations; Settings → cache fix)

Action	Small	Large	Large + syntax error	Large + engine error
Open Settings	782.1 ms → 519.8 ms → 32.6 ms	10,580.2 ms (10.580 s) → 10,723.8 ms (10.724 s) → 31.5 ms	799.8 ms → 504.5 ms → 43.0 ms	20,879.4 ms (20.879 s) → 19,561.0 ms (19.561 s) → 33.1 ms
Close Settings	599.5 ms → 819.7 ms → 41.8 ms	1,007.6 ms (1.008 s) → 1,006.8 ms (1.007 s) → 41.8 ms	672.8 ms → 781.6 ms → 33.6 ms	19,673.1 ms (19.673 s) → 19,362.4 ms (19.362 s) → 40.8 ms
Start Sketch / choose a plane	190.3 ms → 147.5 ms	262.8 ms → 276.0 ms	272.3 ms → 246.6 ms	264.1 ms → 316.0 ms
Enter plane sketch	2,068.0 ms (2.068 s) → 1,142.6 ms (1.143 s)	2,407.3 ms (2.407 s) → 1,609.6 ms (1.610 s)	N/A	N/A
Enter face sketch	3,096.4 ms (3.096 s) → 1,712.7 ms (1.713 s)	2,874.9 ms (2.875 s) → 2,028.9 ms (2.029 s)	N/A	N/A
Edit existing sketch	1,544.3 ms (1.544 s) → 572.7 ms	2,135.0 ms (2.135 s) → 1,080.9 ms (1.081 s)	N/A	N/A
Exit sketch	1,307.3 ms (1.307 s) → 881.0 ms	1,473.7 ms (1.474 s) → 1,348.6 ms (1.349 s)	N/A	N/A
Cube: face	819.2 ms → 415.4 ms	773.6 ms → 496.6 ms	908.9 ms → 398.8 ms	772.3 ms → 400.2 ms
Cube: edge	723.5 ms → 354.9 ms	785.9 ms → 422.9 ms	766.9 ms → 394.2 ms	681.7 ms → 484.1 ms
Cube: corner	737.6 ms → 402.1 ms	708.3 ms → 382.5 ms	775.4 ms → 535.8 ms	782.9 ms → 408.3 ms
Open Convert to Variable	325.5 ms → 17.2 ms	427.8 ms → 16.7 ms	N/A	N/A
Cancel Convert to Variable	15.5 ms → 8.3 ms	14.8 ms → 9.1 ms	N/A	N/A
Apply Convert to Variable	1,224.1 ms (1.224 s) → 1,290.2 ms (1.290 s)	10,412.0 ms (10.412 s) → 9,811.0 ms (9.811 s)	N/A	N/A
Open Telemetry	341.3 ms → 27.4 ms	340.7 ms → 25.4 ms	334.0 ms → 39.0 ms	340.9 ms → 42.4 ms
Close Telemetry	32.0 ms → 36.1 ms	31.8 ms → 39.8 ms	38.2 ms → 38.6 ms	31.8 ms → 47.5 ms
Hover diagnostic badge	207.2 ms → 4.1 ms	206.9 ms → 8.2 ms	207.6 ms → 10.8 ms	213.8 ms → 6.1 ms
Hover feature tooltip	8.9 ms → 9.1 ms	6.2 ms → 5.7 ms	10.3 ms → 9.0 ms	6.9 ms → 6.8 ms
Hover toolbar tooltip	1,035.8 ms (1.036 s) → 18.0 ms	1,027.4 ms (1.027 s) → 16.6 ms	1,017.5 ms (1.018 s) → 17.9 ms	1,017.4 ms (1.017 s) → 18.0 ms
Hide toolbar tooltip	6.6 ms → 3.3 ms	1.8 ms → 11.7 ms	3.5 ms → 14.4 ms	3.2 ms → 7.0 ms
Copy code	414.0 ms → 23.3 ms	415.1 ms → 13.2 ms	424.3 ms → 32.4 ms	432.8 ms → 15.8 ms
Send Zookeeper prompt (fixed protocol response)	2,031.9 ms (2.032 s) → 16.4 ms	2,040.3 ms (2.040 s) → 33.0 ms	2,048.6 ms (2.049 s) → 48.0 ms	2,039.8 ms (2.040 s) → 71.4 ms
Edit KCL / execute model	2,557.3 ms (2.557 s) → 2,066.1 ms (2.066 s)	11,088.1 ms (11.088 s) → 11,943.9 ms (11.944 s)	N/A	N/A
Change density	599.8 ms → 519.2 ms	40,029.0 ms (40.029 s) → 38,521.8 ms (38.522 s)	37,729.6 ms (37.730 s) → 35,828.8 ms (35.829 s)	40,561.2 ms (40.561 s) → 36,025.2 ms (36.025 s)
Drag over folder	405.6 ms → 404.4 ms	510.0 ms → 408.5 ms	418.3 ms → 415.5 ms	415.9 ms → 412.6 ms
Hover geometry / highlight code	456.1 ms → 449.8 ms	526.7 ms → 506.0 ms	503.6 ms → 529.0 ms	582.9 ms → 467.3 ms
Resize viewport	417.2 ms → 417.5 ms	213.8 ms → 224.8 ms	307.8 ms → 220.1 ms	207.2 ms → 190.4 ms
Remove geometry / show planes	2,004.5 ms (2.005 s) → 1,827.6 ms (1.828 s)	1,976.6 ms (1.977 s) → 1,954.4 ms (1.954 s)	N/A	N/A
Add geometry / hide planes	2,391.5 ms (2.392 s) → 2,407.3 ms (2.407 s)	10,723.8 ms (10.724 s) → 12,438.8 ms (12.439 s)	N/A	N/A
Open Settings (Home)	340.8 ms → 39.3 ms (Home)	N/A	N/A	N/A
Close Settings (Home)	14.8 ms → 26.4 ms (Home)	N/A	N/A	N/A
Show browser desktop handoff	876.9 ms → 476.7 ms (web startup)	N/A	N/A	N/A

95/95 cases measured before/after animations. Settings adds the latest cache-fix measurement: 8/8 under 150 ms. Initial model load excluded. Other results remain the animation-only checkpoint (a886a9102c). N/A = unsupported profile. Anything above 150 ms is absolutely insane and people will feel it.

[vercel]

The latest updates on your projects. Learn more about Vercel for GitHub.

Project	Deployment	Actions	Updated
modeling-app	Ready	Preview	Oct 20, 2026 10:02pm UTC

[codspeed]

Merging this PR will not alter performance

✅ 157 untouched benchmarks
⏩ 131 skipped benchmarks¹

---

_{Comparing slow-shit (6e172ee) with main (d3da241)²}

Footnotes

1. 131 benchmarks were skipped, so the baseline results were used instead. If they were deleted from the codebase, click here and archive them to remove them from the performance reports. ↩

2. No successful run was found on main (252827e) during the generation of this report, so d3da241 was used instead as the comparison base. There might be some changes unrelated to this pull request in this report. ↩