what is forced reflow while executing javascript
I wonder what happens when you perform the Force updates and/or click one of the Update Settings buttons using other browsers (e.g. i did remove half and even exclude my main .js file from the project. In summary, by receiving the violation, you were able to optimize your code, and it performs better now. The surrounding elements would be affected if each content block had a different height. It won't let me post the screenshot of the error here, but what the console (google chrome dev tools) says is : " [Violation] Forced reflow while executing Javascript took 53ms". In general, this message prompts you a target for performance tuning. Ok, but as I write above, messages appear also when I'm only point mouse over slider handle. # You can also raise proxy_cache_valid to the same value (e.g. Supporters. (is help and good the only problem is the last 3 updates). After all these years, and impressive competitors, it's still Best In Class." . 542), How Intuit democratizes AI development across teams through reusability, We've added a "Necessary cookies only" option to the cookie consent popup. but: if youre using nginx to cache, why do you still need cache enabler? and all the cache together will show the real execution time of jquery (deprecated). @AndrewEastwood yup it did, actually you can see how it works on prod here. i will update. [Violation] Forced reflow while executing JavaScript took 138ms, Google Chrome, Version 57.0.2987.133 (64-bit). For more details on this particular performance scenario, see also this article. Not the answer you're looking for? Once you've found some code that's taking a long time (50ms is Chrome's threshold), you have a couple of options: (1) and (2) may be difficult or impossible, but it's sometimes really easy and should be your first attempts. The "Verbose" level in the console makes it easier to find performance bottlenecks, in other words why things are so dumb. Update: Chrome 58+ hid these and other debug messages by default. Ok, look at the half you commented out! if ($request_uri ~* (/administrator|/wp-admin|/wp-login.php)) { if ($http_cache_control ~* private) { The browser is a wondrous thing. Usually this is the code that solves the problem, but you can make it much more optimal. Chrome 57 turned on 'hide violations' by default. By clicking Sign up for GitHub, you agree to our terms of service and If practical, make changes to the element before making it visible. (nginx and apache advance configuration FROM THE LINK I SENT YOU ABOVE), BYPASS cache and more techniques nothing not works, try separate and bypass Autoptimize cache enabler and nginx did not work as well #1. The underlying problems are there in the other browsers but the browsers just aren't telling you there's a problem. JavaScript, will trigger the browser to synchronously calculate the Do EMC test houses typically accept copper foil in EUT? No. Already have an account? After inserting this trick code, all warning messages are gone. Active resource loading counts reached a per-frame limit while the tab was in background. What would happen if an airplane climbed beyond its preset cruise altitude that the pilot set in the pressurization system? That means that we force a later stage (layout) into our javascript. positions and geometries of elements in the document, for the purpose } This refers to the re-calculation of positions and dimensions of all elements, which leads to re-rendering part or all of the document. Query the server (just use the input field at the top). @Bungler Dunno, I'd like to know if there's some guideline it's referring to as well. Find centralized, trusted content and collaborate around the technologies you use most. Using flexbox for your main page layout can also have a performance hit because the position and dimensions of flex items can change as the HTML is downloaded. Chrome 57 turned on 'hide violations' by default. React Fragments: A Simple Syntax to Improve Performance, Five Ways to Lazy Load Images for Better Website Performance, How to Improve Page Performance with a Font Loader, 5 Grunt Tasks that Improve the Performance of Your Website, Using Web Workers to Improve Image Manipulation Performance, Improve Browser Performance With the CSS Stress Test Tool. In updating the DOM who gets fastest ? If you make complex rendering changes such as animations, do so out of the flow. Thanks for contributing an answer to Stack Overflow! Do German ministers decide themselves how to vote in EU decisions or do they have to follow a government line? Element Box metrics What does "use strict" do in JavaScript, and what is the reasoning behind it? Minimize CSS rules, and remove unused CSS rules. Sometimes reflowing a single element in the document may require Sign in understand how to improve reflow time and also to understand the Joomla, K2 for Joomla, WordPress, WooCommerce, PrestaShop, Magento etc.) try with them as well: In my case, the one that correlated with warnings in console was from a file which was loaded by the AdBlock extension, but this could be something else in your case. and cache enabler cache him right now, i get better results but is too soon to say it, i need to wait at least 4 hours and then run tests. when I did some calculations forcing rendering of the page In order to understand how and when browsers decide to redraw something, what is repaint and reflow, I recommend reading this article . Solving a Forced Reflow is usually straight forward. # to Apache except only when its required to refresh its cache. The difference is that code snippet 3 does that in the end of the CRP cycle, and then it uses the layout cache instead of recalculating it during the CRP cycle. (example) You can try finding out which one(s) is (are) to blame by re-testing with AO disabled by opening https://locksmithunit.es/?ao_noptimize=1, first, i didnt blame autoptimize, i blame cache enabler , i know you are a kind of partners, if you can look at my site and refresh help me to bypass Are you willing to participate in fixing this issue and create a pull request with the fix . I found the root of this message in my code, which searched and hid or showed nodes (offline). However, a single reflow can be implemented using a DOM fragment and building the nodes in memory first, e.g. Is email scraping still a thing for spammers. Lets assume you wanted to create this bullet list: Adding each element one at a time causes up to seven reflows one when the