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Lead with a complete plugin quick start and add task-oriented usage, troubleshooting, customization, and contribution guides. Preserve the broader plugin framing, correct conflicting contract guidance, support Agents folder reviews, and align repository validation. Convert existing sample references to clickable links without changing knowledge rules. Co-authored-by: Jesper Schulz-Wedde <jesper.schulzwedde@microsoft.com> Co-authored-by: Copilot App <223556219+Copilot@users.noreply.github.com>
28 lines
1.4 KiB
Markdown
28 lines
1.4 KiB
Markdown
---
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bc-version: [15..]
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domain: performance
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keywords: [page-background-task, cue, rolecenter, enqueuebackgroundtask, ui-thread]
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technologies: [al]
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countries: [w1]
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application-area: [all]
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---
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# Calculate expensive cues on a page background task
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> Contributions welcome — open a PR to refine or extend this article.
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## Description
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Role-center cues and CardPart totals that run `CalcFields`, scans, or HTTP on the UI thread freeze the shell until they finish. Page background tasks exist to return the page immediately and fill the number later. Enqueue mechanics, cancellation, and the read-only child session are covered in `microsoft/knowledge/ui/page-background-tasks.md`. This file is the performance trigger: a cue whose value is not needed to *open* the page must not run on the render path.
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## Best Practice
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Bind the cue to a page variable, enqueue a read-only calculation from `OnAfterGetCurrRecord` (not `OnAfterGetRecord` on a list), and apply the result in `OnPageBackgroundTaskCompleted`. Show a placeholder until then.
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See sample: [`page-background-tasks-for-expensive-cues.good.al`](page-background-tasks-for-expensive-cues.good.al).
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## Anti Pattern
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`CalcFields` or a ledger `Count` in `OnOpenPage` / `OnAfterGetCurrRecord` of a CueGroup CardPart with no background task. The Role Center waits on SQL the user may never look at.
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See sample: [`page-background-tasks-for-expensive-cues.bad.al`](page-background-tasks-for-expensive-cues.bad.al).
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