[Request] [Idea] Performance Recommendations

[henry2man]

TL;DR:

As a developer -sometimes- I introduce performance problems in my applications 😅 What if the Flutter plugin helps me detect and fix them?

Full story:

Reviewing some articles on recommendations to improve the performance of applications made with Flutter, I find some elements that could be added to the plugin to help developers improve the performance of their apps.

For example:

• It is recommended not to use methods that create Widgets (or lists of Widgets) within the build() method. Instead, specific Widgets must be created (https://www.youtube.com/watch?v=vVg9It7cOfY&t=1320s, https://blog.codemagic.io/how-to-improve-the-performance-of-your -flutter-app./#dont-split-your-widgets-into-methods)
• It is recommended to use lazy lists instead of creating all items manually (https://flutter.dev/docs/perf/rendering/best-practices#render-grids-and-lists-lazily)
• It is recommended not to use the Opacity widget (https://flutter.dev/docs/perf/rendering/best-practices#pitfalls)

I am not an absolute specialist in performance with Flutter but I have debugged on other platforms and it is a very important element in mobile apps.

My suggestion is that some of these items could appear as part of the warnings and/or as part of a specific performance analysis extension within the plugin.

What do you think?

[stevemessick]

@pq These sound like possible lint additions. What do you think?

[pq]

Excellent ideas @henry2man! I'll transfer this issue over to the linter, which is where such analysis would happen. Thanks!

This issue was moved by pq to dart-lang/linter#2657.