Angular, FormArray

Lazy Load Form Controls

Instead of creating all FormGroups at once, create them on demand as the user scrolls or interacts.

• Maintain raw data separately.
• Create FormGroups only for visible rows.

Use Template-Driven Forms for Read-Only Views

If the form is mostly for display and occasional edits:

• Render plain HTML for read-only rows.
• Convert a row to a reactive FormGroup only when the user clicks "Edit".

Paginate the Data

Instead of loading 20,000 records at once:

• Fetch and display data in pages (e.g., 100–500 records per page).
• Combine with virtual scroll for smoother UX.

Debounce and Throttle API Calls

If you're fetching data from an API:

• Use RxJS operators like debounceTime, switchMap, and distinctUntilChanged to reduce load.
• Consider server-side pagination and filtering.

Optimize Change Detection

• Use ChangeDetectionStrategy.OnPush in your component to reduce unnecessary checks.
• Detach change detection for parts of the DOM that don’t need frequent updates.