kopia lustrzana https://github.com/Tldraw/Tldraw
273ba62e0e
Something was bothering me a bit with the discussion around sqrt's being slow. Looks like `Math.hypot` has a performance cost associated with it. Looking at the Chromium source code: https://chromium.googlesource.com/v8/v8/+/4.3.21/src/math.js?autodive=0%2F%2F#19 and https://source.chromium.org/chromium/chromium/src/+/main:v8/src/builtins/math.tq;l=36?q=math&sq=&ss=chromium%2Fchromium%2Fsrc:v8%2Fsrc%2F it looks like maybe we'd be avoiding the multiple arguments that can be passed into Math.hypot which is maybe the source of the perf hit. Also, interestingly in `math.tq` you can see it doing this funky sqrt calculation: `Float64Sqrt((a / max) * (a / max) + (b / max) * (b / max)) * max` - I think that possibly is trying to avoid some overflow in some cases with bigger numbers, but also possibly with a perf hit. [edit]: OK, actually on Firefox, doing sqrt seems slower - but digging more into this, it looks like doing `** 0.5` instead of `sqrt` is much faster. More related articles: - https://stackoverflow.com/questions/71898044/why-is-math-hypot-so-slow - https://stackoverflow.com/questions/3764978/why-hypot-function-is-so-slow - https://www.reddit.com/r/javascript/comments/wk3e57/askjs_why_mathsqrt_is_so_slow_in_firefox/ [edit again!] looks like this is being fixed in the latest Chrome! https://blog.seokho.dev/development/2024/03/18/V8-optimize-MathHypot.html ``` ┌─────────┬───────┬─────────┬─────────┬─────────┬────────┐ │ (index) │ Cold │ Slowest │ Fastest │ Average │ Total │ ├─────────┼───────┼─────────┼─────────┼─────────┼────────┤ │ old │ 13.39 │ 10.07 │ 9.69 │ 9.98 │ 998.57 │ │ sqrt │ 8.19 │ 6.66 │ 6.61 │ 6.67 │ 667.6 │ │ pow 0.5 │ 1.89 │ 0.28 │ 0.28 │ 0.3 │ 29.79 │ │ new │ 1.64 │ 0.28 │ 0.28 │ 0.29 │ 28.95 │ └─────────┴───────┴─────────┴─────────┴─────────┴────────┘ ``` ### Change Type <!-- ❗ Please select a 'Scope' label ❗️ --> - [x] `sdk` — Changes the tldraw SDK - [ ] `dotcom` — Changes the tldraw.com web app - [ ] `docs` — Changes to the documentation, examples, or templates. - [ ] `vs code` — Changes to the vscode plugin - [ ] `internal` — Does not affect user-facing stuff <!-- ❗ Please select a 'Type' label ❗️ --> - [ ] `bugfix` — Bug fix - [ ] `feature` — New feature - [x] `improvement` — Improving existing features - [ ] `chore` — Updating dependencies, other boring stuff - [ ] `galaxy brain` — Architectural changes - [ ] `tests` — Changes to any test code - [ ] `tools` — Changes to infrastructure, CI, internal scripts, debugging tools, etc. - [ ] `dunno` — I don't know |
||
|---|---|---|
| .. | ||
| api | ||
| src | ||
| CHANGELOG.md | ||
| LICENSE.md | ||
| README.md | ||
| api-extractor.json | ||
| api-report.md | ||
| editor.css | ||
| package.json | ||
| setupTests.js | ||
| tsconfig.json | ||
README.md
tldraw/tldraw
Community
Have questions, comments or feedback? Join our discord or start a discussion.
Distributions
You can find tldraw on npm here.
Contribution
Please see our contributing guide. Found a bug? Please submit an issue.
License
The tldraw source code and its distributions are provided under the tldraw license. This license does not permit commercial use.
If you wish to use this project in commercial product, you need to purchase a commercial license. Please contact us at hello@tldraw.com for more inforion about obtaining a commercial license.
Trademarks
Copyright (c) 2023-present tldraw Inc. The tldraw name and logo are trademarks of tldraw. Please see our trademark guidelines for info on acceptable usage.
Contact
Find us on Twitter at @tldraw or email hello@tldraw.com. You can also join our discord for quick help and support.