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perf(Chart): Batch mark registration from component mounts - #971
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Each registered mark bumped `_markInfosVersion`, invalidating the extents -> domains -> scales chain and every mounted mark's effects, so mounting N marks cost O(N^2). Component registration now coalesces the bumps into one per microtask; `registerMark` stays synchronous. Fixes techniq#970 Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
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Hey @ryceg Very nice, thanks! Regarding performance, you might also want to consider using I had an agent review this as well and it found a small regression from an untested use cases (using per-mark data with motion). It's recommended approach is slightly slower than this PR, but maintains accuracy. Could you review the output below and if looks good to you, update the PR along with the added test for future coverage. Thanks! Thanks for this. The O(N²) fix is real: locally, 400 marks mount in ~35 ms instead of ~1.3 s. Deferring the bump to a microtask does cause one regression, though, and there's a way to get the same speedup without the deferral. Regression: a short window where the chart is wrong
Suggestion: combine the bumps inside Svelte's own update passInstead of // next to _markInfosVersion
/** Bumped by component marks; only the coalescing effect in the constructor reads it */
private _markInfosPending = $state(0);
// registerComponent
return untrack(() => this._addMark(info, () => this._markInfosPending++));
// constructor
let seenPending = 0;
$effect(() => {
const pending = this._markInfosPending;
if (pending === seenPending) return;
seenPending = pending;
untrack(() => this._markInfosVersion++);
});This replaces Mount time in ms, measured after everything settles (alternating runs):
It's a few ms slower than the microtask version at high mark counts, but it behaves exactly like Tests to addThe current tests use it('has every mark in the domain as soon as a synchronous mount returns', () => {
// Nothing between the mount and the next microtask may see a chart missing its marks — code
// that measures or exports a chart right after `mount()`/`flushSync()` reads it there
let ctx: ChartState<any, any, any> | undefined;
render(ManyMarksHarness, {
count: 2,
x: (d: { x: number }) => d.x,
oncontext: (c: ChartState<any, any, any>) => (ctx = c),
});
expect(ctx!.xDomain).toEqual([0, 2]);
});
it('starts domain motion at the domain the marks give, when only the marks carry data', async () => {
// Domain motion takes its first domain without animating. Seen before the marks register it
// is `[null, null]`, which the spring can't ease out of
let ctx: ChartState<any, any, any> | undefined;
render(ManyMarksHarness, {
count: 10,
x: (d: { x: number }) => d.x,
motion: { type: 'spring' },
oncontext: (c: ChartState<any, any, any>) => (ctx = c),
});
await new Promise((resolve) => setTimeout(resolve, 50));
expect(ctx!.xDomain).toEqual([0, 10]);
});Nits
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- Keep domains and scales current before synchronous mounting completes - Avoid repeated reactive graph walks while many marks mount
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##### [v2.9.2](https://github.com/techniq/layerchart/releases/tag/layerchart%402.9.2) ##### Patch Changes - perf(Chart): Batch mark registration so mounting many marks no longer scales with the square of the mark count ([#971](techniq/layerchart#971)) - fix(Html): Clip at the chart's edge, as the SVG layer does, so content in the padding or panned and zoomed into view is no longer cut off ([#982](techniq/layerchart#982)) ##### [v2.9.1](https://github.com/techniq/layerchart/releases/tag/layerchart%402.9.1) ##### Patch Changes - fix(Chart): Facet a series' own `data` so each panel shows only its rows ([#964](techniq/layerchart#964)) ##### [v2.9.0](https://github.com/techniq/layerchart/releases/tag/layerchart%402.9.0) ##### Minor Changes - feat(Bin): Add `Bin` mark grouping points into hexagon, square, or triangle cells ([#953](techniq/layerchart#953)) - feat(GeoBin): Add `GeoBin` mark grouping points into hexagon, square, or triangle cells tiling the sphere ([#953](techniq/layerchart#953)) - feat(Image): Add `z` to raise images off an `isometric` floor ([#953](techniq/layerchart#953)) - feat(Chart): Add `backToFront(items, at)` to the chart context, ordering items for drawing on an `isometric` floor ([#953](techniq/layerchart#953)) - feat: Add `z` to `Ellipse`, `Points`, `Group`, and `AnnotationPoint`, `z1` / `z2` to `Link`, and `z` to `Circle` in pixel mode, to raise them off an `isometric` floor ([#953](techniq/layerchart#953)) - feat(Layer): Clip SVG and HTML layers by default when the chart has a `transform`, as panning and zooming carry content past its edges ([#953](techniq/layerchart#953)) ##### Patch Changes - fix(Image): Share loaded images across canvas `Image`s, so one remounted or given a loaded URL draws it at once instead of flickering ([#953](techniq/layerchart#953)) - fix(Rect): Shade isometric box sides by how far they turn, rather than snapping between two shades ([#953](techniq/layerchart#953)) - fix(Chart): Measure `xPadding` / `yPadding` on an `isometric` chart against the floor laid flat, so padding stays the same share of the floor as the view turns ([#953](techniq/layerchart#953)) - fix(Legend): Label a threshold scale's ramp with its thresholds, and give its swatches one per color labelled with the range it covers ([#953](techniq/layerchart#953)) - fix(Chart): Start a `projection` transform where the projection's `rotate`, `scale`, `translate`, or fit place it, rather than jumping once the transform loads, and keep a globe's roll while dragging ([#953](techniq/layerchart#953)) ##### [v2.8.1](https://github.com/techniq/layerchart/releases/tag/layerchart%402.8.1) ##### Patch Changes - fix(TransformContext): Support `shift` + scroll zoom when the browser reports it as horizontal (`deltaX`) ([#948](techniq/layerchart#948)) ##### [v2.8.0](https://github.com/techniq/layerchart/releases/tag/layerchart%402.8.0) ##### Minor Changes - feat(AnnotationLine|AnnotationPoint|AnnotationRange): Accept a `label` snippet and a mark snippet (`line`, `circle`, `rect`) to render custom markup ([#946](techniq/layerchart#946)) - feat(Tooltip): By default place above a finger or pen instead of below, and expose `tooltip.pointerType` ([#927](techniq/layerchart#927)) ##### Patch Changes - fix(Tooltip): Fix tooltip pointer location when pinch-zoomed, or when wider than the chart ([#927](techniq/layerchart#927)) ##### [v2.7.0](https://github.com/techniq/layerchart/releases/tag/layerchart%402.7.0) ##### Minor Changes - feat(Axis): Add `domain` to label the chart's scale in other units, such as a secondary axis ([#941](techniq/layerchart#941)) - feat(TooltipItem): Add `seriesKey` to simplify setting the label, color, and value from a series ([#941](techniq/layerchart#941)) ##### Patch Changes - fix(Axis): Only drop the last tick of an `xInterval` / `yInterval` axis when it falls on the domain's end ([#941](techniq/layerchart#941)) - fix(Axis): Label `scaleUtc()` ticks in UTC when no `format` is given ([#941](techniq/layerchart#941)) - fix(BarChart): Place a grouped series in its own sub-band when its `value` is an accessor or a field other than its `key` ([#941](techniq/layerchart#941)) - fix(AreaChart|BarChart|LineChart|ScatterChart|PieChart|ArcChart|Layer): Render server-side with `ssr` instead of overflowing the stack ([#940](techniq/layerchart#940)) ([#943](techniq/layerchart#943)) ##### [v2.6.1](https://github.com/techniq/layerchart/releases/tag/layerchart%402.6.1) ##### Patch Changes - fix(TransformContext): Don't click what a pan, rotate, or pinch is released over ([#936](techniq/layerchart#936)) - fix(Chart): Don't ease an `isometric` view's angles while dragging ([#936](techniq/layerchart#936)) - fix(Chart): Ease an `isometric` view added after the chart was created, starting it at its own angles ([#936](techniq/layerchart#936)) ##### [v2.6.0](https://github.com/techniq/layerchart/releases/tag/layerchart%402.6.0) ##### Minor Changes - feat(Contour): Stroke unfilled contours in the bands' colors when no `stroke` is given ([#934](techniq/layerchart#934)) - feat(Frame|Grid|Axis|Highlight): Draw an `isometric` chart's back walls, their gridlines (`<Grid z>`), a height axis (`<Axis placement="back">`), and highlights at a point's height ([#934](techniq/layerchart#934)) - feat: Support `z` heights on an `isometric` chart — boxes (`Rect`, `Cell`, `Calendar`, `Bars` with `valueAxis="z"`), floating `Circle`, `Text`, `Labels` and `ArcLabel`, `Line` stems, and extruded `Polygon`, `Path`, `GeoPath`, `Contour`, `Pie`, `Area` and `Spline` ([#934](techniq/layerchart#934)) - breaking(Chart|Spline|Area): Rename the `z` grouping channel to `g` (ex. `<Spline g="id">`), freeing `z` for a third position ([#934](techniq/layerchart#934)) - feat(TransformContext): Switch `mode` without remounting the chart ([#934](techniq/layerchart#934)) - feat(Chart): Support `view={isometric}` to draw the plot area as a floor seen at an angle, turned with `isometric({ rotate, tilt })` or by dragging (`transform={{ drag: 'rotate' }}`), with `viewport` text facing the viewer ([#934](techniq/layerchart#934)) - feat(Ellipse): Support `rotate` to turn the ellipse about its center ([#934](techniq/layerchart#934)) ##### Patch Changes - fix(TransformContext): Zoom in / out about the middle of the plot area, and center a `canvas` zoom without resetting its scale ([#934](techniq/layerchart#934)) - fix(GeoPath): Start a tweened map shape as itself rather than rising from a baseline ([#934](techniq/layerchart#934)) - fix(Axis): Size an `angle` axis' ticks by its circle rather than the chart's width, so a continuous angle scale's tick count no longer changes with width (square charts get more ticks) ([#934](techniq/layerchart#934)) - fix(Link): Draw links whose ends share an `x` or `y` ([#934](techniq/layerchart#934)) - fix(BrushContext): Draw and measure the brush through a `canvas` pan / zoom ([#934](techniq/layerchart#934)) - fix(TooltipContext): Account for `transform.mode: 'canvas'` pan / zoom in bisect modes and `'data'` tooltip placement ([#934](techniq/layerchart#934)) ##### [v2.5.2](https://github.com/techniq/layerchart/releases/tag/layerchart%402.5.2) ##### Patch Changes - fix(ArcChart|AreaChart|BarChart|LineChart|PieChart|ScatterChart): Support `bind:ref`, and `bind:context` on the `.svg` / `.canvas` variants ([#930](techniq/layerchart#930)) ([#931](techniq/layerchart#931))
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Fixes #970.
Each mark that mounts with
markInfobumped_markInfosVersiononce, and each bump invalidated theflatData→ extents → domains → scales chain plus every mounted mark's effects. Mounting N marks therefore cost O(N²) in dirty-marking. The issue has the profile and the numbers.Change
registerComponentnow adds the mark and queues one_markInfosVersionbump per microtask, so all the marks of one render (and of one unmount) cause a single invalidation. Microtasks drain before paint, so the first frame still has every mark in the domain.registerMarkis unchanged in behaviour: it still bumps synchronously, since it is documented for tests and synchronous contexts. Both paths share_addMark.layerchartpatch.Tests
states/chart.mark-registration.svelte.test.ts(fixture__fixtures__/ManyMarksHarness.svelte):Areas and asserts_markInfosVersionmoved fewer than 5 times (200 onmain);Both fail on
mainand pass with the change. Full suite: 1302 passed, 3 skipped. The one failure,views/isometric.bundle.test.ts, also fails on an unpatchedmainon Windows (import paths come back with\separators).mainDisclosure: this PR was drafted with AI assistance (Claude Code). I've reviewed it.
🤖 Generated with Claude Code