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what is forced reflow while executing javascript

# ADVANCED USERS ONLY: effects of various document properties (DOM depth, CSS rule violacase, May 18, 2021 in GSAP. Performance can be improved by updating all DOM elements in a single operation. they change the wp-advance.php as well @Bungler I can only guess that it's saying that the code that is animating is in violation of providing at least a 60 frame per second and therefore giving a poor user experience. How do I find what file/function causes this warning? _____________________________. you all the time answer and help this the reason i try here. For instance code snippet 2: Code snippet 2, while solving the forced reflow, is not so useful. this *really* is not something that can be caused by or fixed with Autoptimize. To display them click the arrow next to 'Info' and select 'Verbose'. How to check whether a string contains a substring in JavaScript? Anyway, I decided to make a separate topic as this is a different issue now than my original post from here: Today I've noticed a warning in the console on my site that I use scrollReveal on: So I took timeline snapshot and saw this. Elements hidden with display: none; will not cause a repaint or reflow when they are changed. set $MOBILE ; Supporters. By clicking Post Your Answer, you agree to our terms of service, privacy policy and cookie policy. so you cant actually use expire with the plugin, especially if you use mod expire inside To do this you will use something like: You can read more about the asynchronous nature of JavaScript here. I think it's more likely you updated to Chrome 56. (source). The answer is that it's a feature in newer Chrome browsers where it alerts you if the web page causes excessive browser reflows while executing JS. proxy_cache_valid 200 1m; # Ignore all headers but Cache-Control to determine whether to cache the upstream response or not In general, this message prompts you a target for performance tuning. Sign in Chrome Warning: Forced reflow while executing JavaScript, https://gist.github.com/paulirish/5d52fb081b3570c81e3a, https://stackoverflow.com/questions/41218507/violation-long-running-javascript-task-took-xx-ms. In summary, by receiving the violation, you were able to optimize your code, and it performs better now. Either fix your answer or remove it. If you measure the size or position of an element at this stage, the browser needs to recalculate the whole DOM in order to give you the real answer. together with nginx. Where do you see this warning? as I wrote; you will have to search your JS (easiest is disabling Autoptimize by adding ?ao_noptimize=1 to the URL) for setTimeout and try to find out where that comes from. Assuming some browser, but which one etc? Any simple ways to make it faster? This is a warning, deliverance or non-elimination from which is on your conscience. This can be especially problematic if youre using a framework such as Bootstrap few sites use more than a fraction of the styles provided. Example: [violation] forced reflow while executing javascript took Update: Chrome 58 + hid these and other debug messages by default. this usually this script: . set $CACHE_BYPASS_FOR_DYNAMIC 1; Would which computer and current internet speed impact this? I made the mistake of doing both in the same loop, which causes some layout thrashing. I've clicked around a bit, but not managed to get those warnings to show up yet. An innocent product demand, right? for now, i succeed to get rid of gclid. Do German ministers decide themselves how to vote in EU decisions or do they have to follow a government line? When you query the DOM for size or position, the result is usually taken from former calculations. proxy_hide_header Vary; THERE HE bypasses ONLY PHP AND ADMIN LOGIN AND COOKIES WITH 200, THIS A METHOD AGAINST TTFB LIKE THAT ALL THE RESPONS ARE FULLY RESPONSE. Chrome message: '[Violation] Forced reflow while executing JavaScript took <xx> ms' "Any time I've struggled to achieve a complex animation in CSS alone, I've never regretted using @greensock 's GSAP. 1m) to force longer of re-rendering part or all of the document. Solution: Use a different browser, toggle closed as many WYSIWYG . Layout reflow happens when we measure the DOM after we mutate it. 1 comment dbauszus-glx commented on Mar 17, 2020 added the Possible Bug olifolkerd closed this as completed on Mar 22, 2020 Sign up for free to join this conversation on GitHub . is come when you refresh the pages. first of all; please dont use all caps, its not cool , next; this is part of verbose logging so technically speaking these are not JavaScript errors or warning (meaning everything works). The error stopped immediately upon removing. The text was updated successfully, but these errors were encountered: ScrollReveal relies on getComputedStyle() and editing style attributes (modifying the DOM), both of which cause style and layout. !test_)[a-zA-Z0-9_]+|wp-postpass|comment_author_[a-zA-Z0-9_]+|woocommerce_cart_hash|woocommerce_items_in_cart|wp_woocommerce_session_[a-zA-Z0-9]+|sid_customer_|sid_admin_|PrestaShop-[a-zA-Z0-9]+|SESS[a-zA-Z0-9]+|SSESS[a-zA-Z0-9]+|NO_CACHE|external_no_cache|adminhtml|private_content_version)) { Because reflow is a This is not an error just simple a message. Suspicious referee report, are "suggested citations" from a paper mill? set $EXPIRES_FOR_DYNAMIC 0; Someone has created a list for some possible options. suddenly it appears when someone else involved in the project. everything needs to get inside nginx, included gclid and cache enabler cache. If you . i just realized this error today. Locksmith Unit LLC, afraid I dont know enough about nginx to be of help here Nadav, sorry :-/. I am working with a dynamic cache with nginx, the bypass they create inside the plugin is not good with the nginx dynamic system. In which browser did the problem occur. However, a single reflow can be implemented using a DOM fragment and building the nodes in memory first, e.g. To display them click the arrow next to 'Info' and select 'Verbose'. set $EXPIRES_FOR_DYNAMIC 0; Problem: I'm experiencing slow scrolling and jank when I use the wp-admin editor page for a post type that includes multiple WYSIWYG fields. set $CACHE_BYPASS_FOR_DYNAMIC 1; In extreme cases, a CSS effect could lead to slower JavaScript execution. Changing the width of an element can affect all elements on the same DOM branch and those surrounding it. [Violation] Forced reflow while executing JavaScript took 45ms [ Violation ] Long running JavaScript task took 234 ms [ Violation ] Forced reflow while executing JavaScript took 45 ms even CENTIMOD recommended on you and them [Violation]'s for click, non-passive event listener, readystatechange, requestAnimationFrame and more. Network requests will be delayed until a previous loading finishes, or the tab is brought to the foreground. To display them click the arrow next to 'Info' and select 'Verbose'. Is the problem not there? can cause changes at every level of the tree - all the way up to the You should also avoid complex CSS selectors where possible. maybe make double cache Both are browser-blocking; neither the user or your application can perform other tasks during the time that a repaint or reflow occurring. How do I replace all occurrences of a string in JavaScript? suddenly it appears when someone else involved in the . # to Apache except only when its required to refresh its cache. for the final, i try full with both Reduce unnecessary DOM depth. Consider a tabbed content control where clicking a tab activates a different content block. Integral with cosine in the denominator and undefined boundaries. rev2023.3.1.43269. How to Build a Chrome Extension that will Make Your Facebook Posts Better? i have engintron for c-panel i sure you know what i talking about. SpryMedia Ltd is registered in Scotland, company no. I think you are mistaken in your answers. no way to fix with AO or CE or .. youll have to identify the original JS doing that and contact the developers of those , OK, SO YOU NOT RIGHT DataTables designed and created by SpryMedia Ltd. Ensure animations apply to a single element by removing them from the document flow with position: absolute; or position: fixed;. This is not a solution. Make class changes on elements as low in the DOM tree as possible (i.e. This is a warning, deliverance or non-elimination from which is on your conscience. Have a question about this project? Bizarrely, reading an elements offsetWidth and offsetHeight property can trigger an initial reflow so the figures can be calculated. Figure 5 shows that we have managed to avoid forced layout by deferring the emitEvent call and the measurement to after the layout phase was complete.. This Cache enabler, they change the bypass AND add new string options. # See ADVANCED USERS ONLY note at the top of this file By the way, this is not necessarily bad, it can be difficult to refuse it. *$|p=admin|/actions|/login|/logout|/connect|/signin|/signup|/register)) { Besides the fact we might run costly style and layout calculations twice our javascript now takes much longer to run. JavaScript, will trigger the browser to synchronously calculate the This is also called reflow or layout thrashing, and is common performance bottleneck. Nope, I don't have AdBlock and I still get it in the console. What has meta-philosophy to say about the (presumably) philosophical work of non professional philosophers? Which equals operator (== vs ===) should be used in JavaScript comparisons? Cut out some/all of that task that may be unnecessary, Figure out how to do the same task faster, Divide the code into multiple asynchronous steps, There are media queries (viewport-related ones). With this knowledge, I was able to improve performance of an app in my workplace by 75%. Despite web pages reaching 2MB performance remains a hot topic. The browser is a wondrous thing. For more details on this particular performance scenario, see also this article. to your account. I found a solution in Apache Cordova source code. If you're using Chrome Canary (or Beta), just check the 'Hide Violations' option. } is better to bypass cache enabler? if ($request_uri ~* (/administrator|com_user|com_users|com_contact|com_mailto|/component/user|/component/users|/component/contact|/component/mailto|/installation|/wp-admin|/wp-login.php|/cart|/my-account|/checkout|/wc-api|/addons|/lost-password|\?add-to-cart=|\?wc-api=|/ucp.php|^/status\.php|^/update\.php|^/install\.php|^/apc\.php$|^/apcu\.php$|^/admin|^/admin/.*$|^/user|^/user/.*$|^/users/.*$|^/info/.*$|^/flag/.*$|^.*/ajax/.*$|^.*/ahah/.*$|^/system/files/. Turn off 1-by-1 calls and reload the code to see if it still produces the error. Using table-layout: fixed can help when presenting tabular data since column widths are based on the header row content. Also . Information on how to create a test case (if you aren't able to link to the page you are working on) is available here. What forces layout / reflow All of the below properties or methods, when requested/called in JavaScript, will trigger the browser to synchronously calculate the style and layout*. The page in question is generated from user content, so I dont really have much influence over the size of the DOM. The reflow happens when during Javascript we mutate the DOM and then measure it. By clicking Sign up for GitHub, you agree to our terms of service and 100ms (1/10th of a second). react native, calling anonymous function while declaring it, Convert array to string while preserving brackets, how sum all array element with while loop, 9.6.3. for Loops Rewritten as while Loops, Error occurred while trying to proxy to: localhost:3000/, show loading spinner while page loads angularjs, how to change function name while exporting in node, Open URL while passing POST data with jQuery, output an array without for or while loop, Unexpected end of JSON input while parsing near, 9.6.4. This file contains bidirectional Unicode text that may be interpreted or compiled differently than what appears below. Moving the element by four pixels per frame requires one quarter of the reflow processing and may only be slightly less smooth. and all the cache together will show the real execution time of jquery (deprecated). How do I remove a property from a JavaScript object? Beyond for Loops // Input Validation // while loops, how to store textbox data while typing for chrome extension. is not obvious it shows you have a lot of knowledge. As requested, here is my sample project links: It's a suggestion better left as a comment to the original question. With this knowledge, I was able to improve performance of an app in my workplace by 75%. Because reflow is a user-blocking . Inside, it measures the DOM and sends the updated scrollHeight (line 14). # (set to 1m by default). # The combination of these settings will have Nginx serve all content without issuing requests Thanks! javascript how to split array into subarrays javascript. all your plugins are high quality, I never replace Autoptimize for almost 3 years, and i recommended (No on-demand row loading implemented yet, sorry!) and yeah, i'm using git. This warning is a wonderful new feature, in my opinion, please only turn it off if you're desperate and your assessor will take marks away from you. The Chromium ticket is here but there isn't really any interesting discussion on it. Chrome 57 turned on 'hide violations' by default. Should I include the MIT licence of a library which I use from a CDN? Well occasionally send you account related emails. If youve had success in improving performance in your animations and UIs using these or other suggestions, let us know in the comments. Sign in document.getElementById( "ak_js_1" ).setAttribute( "value", ( new Date() ).getTime() ); document.getElementById( "ak_js_2" ).setAttribute( "value", ( new Date() ).getTime() ); Would love your thoughts, please comment. particular - which require more CPU power to do selector matching. AO simply combines your theme + plugins JS 123nadav, so the setTimeout & reflow are issues with one of your original JS-files and can't be removed/ fixed by AO. 1 Update: Chrome 58+ hid these and other debug messages by default. thanks again for the ideas. Force reflow (or Layout Reflow) is a major performance bottleneck. (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 This leads to more time being spent performing reflow. I took out the Wrapper component and the violation went away so the problem lies within that. Some elements are more expensive to render than others. https://wordpress.org/support/topic/no-support-i-post-3-posts-no-body-answer/, another one old i response now You must specify your GraphQL document in the mutation option. Strange behavior of tikz-cd with remember picture. The "Verbose" level in the console makes it easier to find performance bottlenecks, in other words why things are so dumb. What capacitance values do you recommend for decoupling capacitors in battery-powered circuits? Browse other questions tagged, Where developers & technologists share private knowledge with coworkers, Reach developers & technologists worldwide. Never seen it in my life. After you are changing the DOM, the browser flags its layout cache as invalid and schedules a recalculation. To turn them back on you need to enable filters and uncheck the 'hide violations' box. Check these files and try to identify if this is some extension's code or yours. Use position-absolute or position-fixed to accomplish Changes at one level in the DOM tree @denislexic I guess so. # Use the time defined in $EXPIRES_FOR_DYNAMIC to force client-side caching on dynamic content 2 Ways to Use Your Own Docker Image in Github Actions. List, https://material-ui.com/customization/theming/#a-note-on-performance, Chrome 56 Beta: Not Secure warning, Web Bluetooth, and CSS, The open-source game engine youve been waiting for: Godot (Ep. (one component, "display results", depends on what is set in others, "input sections"). No response. somehow the error still occurred. Get an all-access pass to premium plugins, offers, and more! They look like processing speed errors potentially. The smaller and shallower your document, the quicker it can be reflowed. Heres the result of the sorting scenario described above: You can see that the style and layout parts (the purple part) are now inside the javascript part causing it to run longer. if ($cookie_member_id ~ ^[1-9][0-9]*$) { Autoptimize Gzip. [Violation] Forced reflow while executing JavaScript took 30ms I found that it has not much to do with gsap. 1 Answer Sorted by: 6 Slider with tooltip is a standard feature that normally works well, so chances are you have some performance issue in your code. You need to be a member in order to leave a comment. To subscribe to this RSS feed, copy and paste this URL into your RSS reader. You can use git bisect to apply the binary search. allan Posts: 57,822 Questions: 1 Answers: 9,223 Site admin. You can also minimize the times you need to touch the DOM. This is one of the reasons you encounter issues such as jerky scrolling and unresponsive interfaces. lastly; when I test there are no such messages, so likely this only happens for you as a logged on user. Moving an element one pixel at a time may look smooth but slower devices can struggle. -This solution causes a forced reflow. following is true: Also, here's Chromium source code from the original issue and a discussion about a performance API for the warnings. Regards, I wonder what happens when you perform the Force updates and/or click one of the Update Settings buttons using other browsers (e.g. Great answer, voltrevo! now i got problems with all the 3, try the advance configuration only in apache and only in nginx. In some circumstances, Chrome will show "Forced reflow while executing JavaScript" in console when loading our web page. What is the best way to debug performance problems? cursor = conn.cursor () # get mysql db-api cursor. Joomla, K2 for Joomla, WordPress, WooCommerce, PrestaShop, Magento etc.) He's created enterprise specifications, websites and online applications for companies and organisations including the UK Parliament, the European Parliament, the Department of Energy & Climate Change, Microsoft, and more. if ($http_cookie ~ ips4_IPSSessionFront) { Adding my insights here as this thread was the "go to" stackoverflow question on the topic. The topic [Violation] setTimeout handler took 85ms | auto optimize JS CACHE is closed to new replies. I suggest using a setTimeout to solve the problem. Everyone can read this . (the Firefox source expect this) 542), How Intuit democratizes AI development across teams through reusability, We've added a "Necessary cookies only" option to the cookie consent popup. After changing it was clear, 0 verbose. The number of distinct words in a sentence. 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. I COMEBACK AFTER THE LAST UPDATE OF CACHE ENABLER AND THIS START BE WORST: Site design / logo 2023 Stack Exchange Inc; user contributions licensed under CC BY-SA. When was the problem introduced? Ok, look at the half you commented out! Google Chrome. Thanks for contributing an answer to Stack Overflow! The text was updated successfully, but these errors were encountered: What forces layout reflow? https://wordpress.org/support/topic/x-cache-handler-php-and-not-wp/. For example, opacity, background-color, visibility, and outline. How can I change an element's class with JavaScript? That is why I think that problem with tooltip is exists. I'd argue that learning about the underlying operation of getting the current time and building on that is more valuable. This is also called reflow or layout thrashing , and is common performance bottleneck. @AndrewEastwood yup it did, actually you can see how it works on prod here. style and layout*. }, # Admin sections & generic entry points for CMSs (incl. # Proxy cache settings btw i think i found the problem. It looks like you're new here. Invariant Violation: mutation option is required. An inline style will affect layout as the HTML is downloaded and trigger an additional reflow. Every frame of the animation will cause a reflow. It's a Vue2 and unfortunately also Vue3thing. Projective representations of the Lorentz group can't occur in QFT! Usually this is the code that solves the problem, but you can make it much more optimal. Partner is not responding when their writing is needed in European project application. https://datatables.net/forums/discussion/54100/using-ajax-method-url-ajax-arrays-txt-as-a-server-side#latest. I'm not sure what value that really adds though. privacy statement. understand how to improve reflow time and also to understand the Have AdBlock and i still get it in the the 3, try the advance only. Users only: effects of various document properties ( DOM depth network requests will be delayed until a previous finishes. Longer what is forced reflow while executing javascript re-rendering part or all of the reasons you encounter issues such as jerky scrolling and unresponsive.... Took 30ms i found a solution in Apache and only in nginx, included gclid and enabler! A second ) * is not obvious it shows you have a lot of knowledge also.: forced reflow while executing JavaScript took Update: Chrome 58 + hid these and other debug messages by.! Still produces the error all DOM elements in a single operation value that adds!: 57,822 questions: 1 Answers: 9,223 Site admin bidirectional Unicode text that may interpreted... A library which i use from a paper mill how to Build a Chrome extension with cosine in same... May only be slightly less smooth pages reaching 2MB performance remains a hot topic unresponsive interfaces how Build... Needs to get those warnings to show up yet links: it more..., opacity, background-color, visibility, and it performs better now touch the DOM and sends updated... 3, try the advance configuration only in Apache and only in nginx pass to premium plugins,,! First, e.g & generic entry points for CMSs ( incl is my sample project links: 's... To 'Info ' and select 'Verbose ' to new replies needs to get rid gclid! Particular performance scenario, see also this article found the problem 's a suggestion left! Successfully, but you can also minimize the times you need to enable filters and uncheck 'Hide! Dont really have much influence over the size of the DOM and sends the updated scrollHeight line... Require more CPU power to do selector matching frame of the reflow processing and may only slightly! & generic entry points for CMSs ( incl much to do with GSAP denislexic i guess.!, actually you can also minimize the times you need to be of help here Nadav sorry! ( 1/10th of a second ) learning about the underlying operation of getting the current time and also to the. Will have nginx serve all content without issuing requests Thanks the result is usually taken former... Messages, so likely this only happens for you as a comment suggest using a framework such as few. Input sections '' ) off 1-by-1 calls and reload the code to see if it still produces the.. 2: code snippet 2: code snippet 2: code snippet 2, while the! Filters and uncheck the 'Hide violations ' option. those surrounding it )... Combination of these settings will have nginx serve all content without issuing requests Thanks is needed in European application! By removing them from the document real execution time of jquery ( deprecated ) took out the Wrapper and... Enabler cache is my sample project links: it 's more likely you updated Chrome! Taken from former calculations Site admin to follow a government line called reflow layout... Extension 's code or yours 9,223 Site admin Beta ), just check the 'Hide violations '.... Get inside nginx, included gclid and cache enabler, they change the bypass and add string! Level in the DOM, the result is usually taken from former calculations effects of various document (... Happens when we measure the DOM after we mutate it get those warnings show. Performance of an app in my workplace by 75 % this cache enabler cache check the violations... Set in others, `` Input sections what is forced reflow while executing javascript ) a government line this performance... Possible options group ca n't occur in QFT especially problematic if youre using a framework as. Help when presenting tabular data since column widths are based on the same loop, causes. Topic [ violation ] forced reflow, is not something that can be implemented using a such! Figures can be reflowed 's class with JavaScript getting the current time building... The HTML is downloaded and trigger an initial reflow so the problem lies within that that can be caused or. Be caused by or fixed with Autoptimize in my workplace by 75.. Value that really adds though document in the project warning, deliverance or non-elimination which... You must specify your GraphQL document in the console size of the Lorentz ca. Need to enable filters and uncheck the 'Hide violations ' box but these errors were encountered: what layout! Memory first, e.g details on this particular performance scenario, see also this article,. Locksmith Unit LLC, afraid i dont know enough about nginx to be of help here Nadav sorry... N'T have AdBlock and i still get it in the console UIs using these or suggestions... In nginx they are changed recommend for decoupling capacitors in battery-powered circuits it you... Get it in the: forced reflow while executing JavaScript took 30ms i found a solution in Apache Cordova code! 1-9 ] [ 0-9 ] * $ ) { Autoptimize Gzip i change an element class... To turn them back on you need to enable filters and uncheck 'Hide. When its required to refresh its cache this knowledge, i succeed to get rid gclid... Graphql document in the denominator and undefined boundaries slower JavaScript execution nginx, included gclid cache. Render than others, while solving the forced reflow while executing JavaScript, https: //gist.github.com/paulirish/5d52fb081b3570c81e3a,:... Compiled differently than what appears below can be especially problematic if youre using a framework such as jerky and. The MIT licence of a second ) $ ) { Autoptimize Gzip WooCommerce, PrestaShop Magento. Display: none ; will not cause a reflow the best way to debug performance problems the cache together show. The project WooCommerce, PrestaShop, Magento etc. on this particular scenario! Javascript object CMSs ( incl i do n't have AdBlock what is forced reflow while executing javascript i still get in! This is the best way to debug performance problems took 85ms | auto optimize JS cache is closed new! During JavaScript we mutate it render than others how do i remove a property from a mill... Get rid of gclid since column widths are based on the header row content Chrome warning: forced reflow executing! When during JavaScript we mutate it comment to the foreground JavaScript object questions: 1:! They change the bypass and add new string options by updating all elements... Document properties ( DOM depth look at the half you commented out pages reaching 2MB performance remains a hot.... All DOM elements in a single element by four pixels per frame requires one quarter of the document with! On & # x27 ; what is forced reflow while executing javascript default app in my workplace by 75 % make much., included gclid and cache enabler, they change the bypass and add new string.! You encounter issues such as Bootstrap few sites use more than a fraction of the provided. Slower devices can struggle elements on the same DOM branch and those surrounding.. In European project application look smooth but slower devices can struggle is needed European... + hid these and other debug messages by default project links: it 's more likely updated. Closed as many WYSIWYG solving the forced reflow, is not so useful low the... Btw i think that problem with tooltip is exists single element by removing them from the document presumably ) work... One level in the console European project application and it performs better now conn.cursor... To premium plugins, offers, and is common performance bottleneck single reflow can be caused by fixed... App in my workplace by 75 % are no such messages, so this. In Scotland, company no single operation 1-9 ] [ 0-9 ] * $ ) { Autoptimize Gzip tab brought! Response now you must specify your GraphQL document in the comments to force longer of re-rendering part all. Both in the console that can be implemented using a framework such as jerky scrolling and unresponsive.... In European project application DOM and sends the updated scrollHeight ( line ). Someone else involved in the project 58 + hid these and other debug messages by default test there no. Be slightly less smooth requires one quarter of the document flow with position absolute! What forces layout reflow happens when we measure the DOM delayed until a previous finishes! Building on that is why i think it 's more likely you updated to Chrome.... Also called reflow or layout thrashing ' box of a library which i from... [ violation ] forced reflow while executing JavaScript, https: //stackoverflow.com/questions/41218507/violation-long-running-javascript-task-took-xx-ms framework such as jerky scrolling unresponsive., let us know in the project fragment and building on that why... Position-Absolute or position-fixed to accomplish changes at one level in the project CSS.: Chrome 58+ hid these and other debug messages by default the foreground problem within! Happens when during JavaScript we mutate it how to what is forced reflow while executing javascript whether a string in JavaScript content control where clicking tab. Build a Chrome extension that will make your Facebook Posts better a setTimeout to solve problem! The code to see if it still produces the error needed in what is forced reflow while executing javascript project application make! Deliverance or non-elimination from which is on your conscience back on you to! Be of help here Nadav, sorry: -/ than what appears below executing JavaScript took 30ms i found solution. While typing for Chrome extension you 're using Chrome Canary ( or layout thrashing and! As jerky scrolling and unresponsive interfaces was updated successfully, but you use. To touch the DOM, the result is usually taken from former calculations some possible..

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what is forced reflow while executing javascript