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One free scan finds every outdated or missing driver and matches the right update for your exact hardware.Free scan · exact hardware matchRender or reveal the page’s core content on its own path, then start optional widget requests independently. Promise.allSettled() lets you handle each widget’s success or failure separately—but it waits for every input to settle, so awaiting it before rendering core content would still block that content.
Keep optional widgets off the core rendering path
Separate required data from enhancements. Load and render the content the page needs first; start recommendations, related articles, weather, or other optional widgets without making core rendering depend on their results.
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Promise.allSettled() aggregates promise outcomes. It does not make requests finish sooner, cancel slow work, or move JavaScript off the main thread. If you call it from the core path and wait for it before rendering, the page still waits for the slowest widget.
Start widget requests together and handle each outcome
For independent widgets, start each loader and pass the resulting promises to Promise.allSettled(). Once every promise has settled, inspect each result and update only its corresponding container.
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renderCoreContent(coreData);
const widgetLoads = [
loadRecommendations(),
loadRelatedArticles(),
loadWeather(),
];
Promise.allSettled(widgetLoads).then((results) => {
const [recommendations, articles, weather] = results;
if (recommendations.status === "fulfilled") {
renderRecommendations(recommendations.value);
} else {
reportWidgetError("recommendations", recommendations.reason);
showWidgetFallback("recommendations");
}
if (articles.status === "fulfilled") {
renderRelatedArticles(articles.value);
} else {
reportWidgetError("articles", articles.reason);
showWidgetFallback("articles");
}
if (weather.status === "fulfilled") {
renderWeather(weather.value);
} else {
reportWidgetError("weather", weather.reason);
showWidgetFallback("weather");
}
});The array of outcomes follows the input order. Keep the result handling aligned with the promise array; a positional mismatch can send one widget another widget’s data. Each result has a status of "fulfilled" or "rejected". Read value only for fulfilled results and reason only for rejected ones. (See MDN’s Promise.allSettled() reference.)
Use async/await without making the core wait
An async function can await required core data, render it, and only then await optional widget work. The await pauses that function at the aggregate; other program activity can continue, but later statements in that function wait for the widgets.
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async function loadPage() {
const coreData = await loadCoreData();
renderCoreContent(coreData);
const results = await Promise.allSettled([
loadRecommendations(),
loadRelatedArticles(),
]);
updateOptionalWidgets(results);
}Here, the core-data request is required, so it remains on the core path. The optional requests are aggregated only after core content has been rendered. If the application’s rendering framework delays making that content visible until loadPage() finishes, adjust the rendering boundary so optional work does not gate that visibility.
Associate results with widget identity
For a changing set of widgets, keep identifiers alongside loaders rather than relying on a manually maintained list of result variables. The index still connects each outcome to its input, so preserve the same array when mapping results.
const optionalWidgets = [
{ id: "recommendations", load: loadRecommendations },
{ id: "articles", load: loadRelatedArticles },
];
const results = await Promise.allSettled(
optionalWidgets.map(({ load }) => load()),
);
results.forEach((result, index) => {
const { id } = optionalWidgets[index];
if (result.status === "fulfilled") {
renderWidget(id, result.value);
} else {
reportWidgetError(id, result.reason);
hideWidgetOrShowFallback(id);
}
});Choose between Promise.all() and Promise.allSettled()
| Method | Failure behavior | What you get | Best fit |
|---|---|---|---|
Promise.all() |
Rejects as soon as an input rejects. Other operations continue, but their outcomes are not included in the rejected aggregate. | A combined array of values if every input fulfills; otherwise a rejection. | Results are jointly required, and one failure should fail the combined operation. |
Promise.allSettled() |
Does not reject just because an input rejects; fulfills after all inputs settle. | An outcome record for every input, indicating fulfillment or rejection. | Tasks are independent and each result should be handled separately, as with optional widgets. |
Neither method is a performance shortcut: both aggregate promises, and neither makes the browser render content sooner by itself. Choose according to whether tasks are jointly required or independently useful. (See MDN’s Promise.all() reference.)
Handle slow, failed, and visually disruptive widgets
- A rejection: show an appropriate fallback or omit that widget while leaving unrelated widgets and core content intact. Record the failure for debugging or monitoring rather than silently treating a broader outage as success.
- A promise that never settles: keeps the aggregate pending indefinitely.
Promise.allSettled()is not a timeout; implement a separate deadline or cancellation policy if the interface requires one. - A late layout change: reserve space where practical or show a clear loading or empty state, so a widget’s eventual appearance is less disruptive to the page layout.
- Heavy synchronous work: promise aggregation does not prevent JavaScript from occupying the main thread and delaying rendering or interaction.
Make the loading strategy match the rendering goal
Promises control how asynchronous outcomes are coordinated; browser resource loading and rendering strategy are separate concerns. Keep non-critical resources and JavaScript out of the critical rendering path, defer non-critical scripts when appropriate, and minimize main-thread work. A blocking script can delay parsing or painting before promise handling has any chance to help. See MDN’s lazy-loading guide, MDN’s critical rendering path guidance, and MDN’s guidance on optimizing long tasks.
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MDN’s lazy-loading guide reports historical median resource-weight figures for 2011–2019: approximately 100–400 KB on desktop and 50–350 KB on mobile. Those historical figures are context about resource growth, not current measurements or evidence of a performance gain from Promise.allSettled().
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