<commit_before>This page describes an advanced technique to avoid Reagent's "anonymous callback" inefficiency. 

This technique is only useful when you are writing 
performance-critical components. Indeed, you may never need it, but 
understanding it will deepen your knowledge about Reagent.

A performance-critical component would need to be: 
  
  1. repeatedly used on a page, perhaps within the rows of a list or cells of a grid
  2. and then be re-rendered ***a lot***
  3. and involve creating anonymous callback functions in re-renders 
<commit_msg>Update on-stable-dom-handlers.md<commit_after>This page describes an advanced technique to avoid Reagent's "anonymous callback" inefficiency. 

This technique is only useful when you are writing 
performance-critical components. Indeed, you may never need it, but 
understanding it will deepen your knowledge about Reagent.

A performance-critical component would need to satisfy all of the following: 
  
  1. be repeatedly used on a page, perhaps within the rows of a list, or the cells of a grid, or the branches of a tree
  2. and then be re-rendered ***a lot***
  3. and involve creating anonymous callback functions in re-renders 

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