Lightning Web Components: Best Practices to Enhance Performance

January 22, 2021by Ananya Mohapatra0

There are many ways to improve lightning web component performance. Here, we are discussing some of the essential practices.

  • Data Caching

Application composition is a meaningful way used to build apps by assembling different components. But here is another problem, the independent nature of components leads them to make their own decisions that affect their overall performance. 

Suppose there are many components in the ecosystem that make their call to the server. The server is flooded with calls, creating massive traffic of incoming calls. The server should get a single call rather than many calls from the components.

Data caching improves performance by distributing the data among different components, which reduces the server load and response time.

The Lightning web component has in-built features for client-side caching.

  • Lightning Data Service

Salesforce uses Lightning data service to improve data flow between the components. 

It is responsible for managing records, fetching records from the server when requested. It also shares the records between the components when requested and stores the documents in a highly efficient client cache.

Lightning data service helps in executing these operations quickly:

  • Loading a record
  • Saving a record
  • Creating a record
  • Deleting a record
  • Record changes
  • Reported errors

  • Use Performance Tools for Improvement

Tools like “Chrome timeline inspector” and “Salesforce Lightning inspector” are for understanding performance issues.

Chrome timeline inspector:

The Chrome timeline inspector tool enables you to inspect the component attributes, profile performance of the components and navigates the component tree.

The extension helps to:

  • Identify bottlenecks in the performance.
  • Simulates error conditions or dropped action responses
  • Navigate the component roadmap in your app
  • Track the handling for one or more actions

Salesforce Lightning Inspector:

The Salesforce Lightning Inspector improves the Lightning Component development, giving access to data about the components and application.  

With the Salesforce Lightning Inspector :

– Easily navigate and inspect the structure of the components

– Identify performance bottlenecks 

– Faster debugging of server interactions by monitoring

– Inspect components and associated DOM elements

– Handling sequences and track firing of events

  • Data Retrieval

There are various available options for data retrieval from the server using lightning web components.

These things have to be kept in mind while optimizing server round trips.

  • Make sure there is no other option to get the data before making a server call.
  • Use the cache data or lightning data service wherever possible.
  • Use Javascript arrays that have built-in functions for sorting, filtering & finding values.
  • Don’t preload data that the user may never need for their use.

  • Component Instantiation

Showing every piece of tool and data on the screen is not considered a great practice. 

It impacts the performance of the application. 

Lightning Components are added to a page layout, which instantiates when the page is loaded.

The interaction design guidelines favor progressive disclosure.

As per Wikipedia

“Progressive disclosure is defined as an interaction design technique often used in human-computer interaction to help maintain the focus of a user’s attention by reducing clutter, confusion, and cognitive workload.

It improves usability by presenting only the minimum data required for the task at hand.”

These practices bring out the best performance from Lightning web components. We hope all the Salesforce Developers will enjoy reading and implementing them. 

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