Performance

Speed

App size

Flutter performance basics

Note:
  If your app has a performance issue and you are
  trying to debug it, check out the DevTool’s page
  on Using the Performance view.

What is performance? Why is performance important? How do I improve performance?

Our goal is to answer those three questions (mainly the third one), and 
anything related to them. This document should serve as the single entry 
point or the root node of a tree of resources that addresses any questions 
that you have about performance.

The answers to the first two questions are mostly philosophical,
and not as helpful to many developers who visit this page with specific
performance issues that need to be solved.
Therefore, the answers to those 
questions are in the appendix.