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Performance considerations when customizing the mobile app

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The foundation of the Dynamics 365 Field Service mobile app is a model-driven app. Thus, general guidelines and best practices for performant apps and performance consideration for model-driven apps apply too.

Remove Console.log from production code

Logging data to the console can increase memory pressure, as the console prevents items from being cleaned up. It's also best not to log data to the console during production, as this can unintentionally print sensitive data that is observable by the end user. This includes console.log, console.warn, and console.error.

If not using QuickNotes, remove QuickNotes WebResource

The QuickNotes control bundle exists twice within Field Service: once as a PCF control and once as a web resource. If QuickNotes control (or any other control) won't be used, remove the control's bundle.js (if present) from the web resources in the form properties. This will prevent downloading the control code when not necessary.

The bundle can be removed by going to the booking and work order form for the bookable resource booking entity, opening Form Properties, and removing the cc_MscrmControls.FieldControls.QuickNotesControl/bundle.js item from the Events tab.

Minifying Office UI imports in PCF controls

If using the @fluentui/react library for interactive UI components, it's possible to import more modules than intended based on how the import is defined. By being specific about the path that you are importing components from, you can dramatically reduce the size of your components (resulting in less data needing to be downloaded).

For example:

import { Button } from '@fluentui/react'
should be written as: 
import { Button } from '@fluentui/react/lib/Button';

Use connected forms to minimize navigation across different entities

Field Service lets you use data from different tables on a form. Fewer navigation actions means less loading time. Form components have a lower peak memory value when navigated to, in comparison to scenarios that use quick-find navigation instead.

For more information, see Edit the booking and work order form.

Remove unused controls from the app

If app users are not using certain controls in the mobile app, consider removing them to reduce memory usage. Having unnecessary controls in the form increases the memory consumption of the app, leading to performance degradation. For example, the timeline control is included by default on several tables and forms. If your scenario doesn't leverage the timeline, consider removing it to reduce memory consumption.