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I want to count how many times a DOM node flashed, over some period of time.
#How to measure with osirix lite update
Instead what I want is, for example, in Dev Tools if you open the Elements panel you can see DOM nodes flashing visually when an update happens. I can do this for renders easily, and I actually have a hook called useCountRenders(). But I want to measure (count) DOM manips for a node, not renders, and produce a number programmatically. I've read all of those and more, and I understand perfectly WHY and when in theory things render, and when they will result in a DOM manips. I'm asking, how many times did reconciliation result in a DOM manipulation. I'd suggest reading these articles for more details:Ī (Mostly) Complete Guide to React Rendering Behavior You can measure the number of times a given component rendered by either adding a useEffect and logging/counting there, or using the API around a given subtree.įrom the problem statement, though, it feels like the question of perf is less a question of "how many times did React have to modify the DOM", and more about "how many times did it have to render overall and what components did it re-render each time". As far as I know, there's no meaningful way to measure that. It sounds like you're asking for "count the number of times React actually had to modify the DOM contents in any way". There just may not be any changes necessary (ie, you re-render a component and it returns the same JSX element output as last time). Technically there's a commit phase at the end of every render pass.
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"Committing" is the final stage, where any necessary changes are applied to the DOM "Reconciliation" is the process of diffing the old and new JSX elements to determine if you've asked for changes to be made to the DOM
![how to measure with osirix lite how to measure with osirix lite](https://i.ytimg.com/vi/khyRc-175is/hqdefault.jpg)
"Rendering" is the process of calling the function components and returning JSX elements I think I know what you're really asking for, but the terminology is a bit off here.
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