Chrome violation Violation Handler took 83ms of runtime

Question

I m trying to implement the Facebook s logout functionality in my project  Login works just fine  But I m facing the getting the following message in JavaScript console with the logout code       Violation  Long running JavaScript task took 318ms session php 51  1   sdk js 135        Violation  Handler took 83ms of runtime  50ms allowed    I ve tried to search for other similar threads and those solutions didn t work out for me  I tried removing parts of my code and see which part is giving problem  Its quite clear that its getting the error due to Facebook s JS SDK as seen in the message  I ve also disabled all of my Chrome extensions   The code works fine in Firefox but not in Chrome  nor in Opera  Is there any method for me to extend this timeout duration  Or any other method to fix this issue in chrome  Here is my code for logout    lt  php     session start          echo   SESSION  current user          echo   COOKIE  current user        session destroy        unset   COOKIE  current user         setcookie  current user     time   -3600          0         header  location  login php      gt    lt  doctype html gt    lt html gt   lt head gt   lt  head gt   lt body gt    lt script gt          Default settings     window fbAsyncInit   function             FB init               appId          lt app-id gt                cookie       true              xfbml        true              version       v2 8                      FB AppEvents logPageView                    function d  s  id           var js  fjs   d getElementsByTagName s  0           if  d getElementById id    return           js   d createElement s   js id   id          js src      connect facebook net en US sdk js           fjs parentNode insertBefore js  fjs         document   script    facebook-jssdk          window onload   function            logout              function logout            console log  1            FB getLoginStatus function response            if  response status      connected                 FB logout                console log  2                window location  login php               console log  3                      else              console log  4                window location  login php               console log  5                                 lt  script gt   lt  body gt   lt  html gt    For obvious reasons I ve removed the App-Id from the code  Any help is appreciated

User · Answer

Chrome violations  don t represent errors in either Chrome or your own web app  They are instead warnings to help you improve your app  In this case  Long running JavaScript and took 83ms of runtime are alerting you there s probably an opportunity to speed up your script     Violation  is not the best terminology  it s used here to imply the script  violates  a pre-defined guideline  but  warning  or similar would be clearer  These messages first appeared in Chrome in early 2017 and should ideally have a  More info  prompt to elaborate on the meaning and give suggested actions to the developer  Hopefully those will be added in the future

User · Answer

Perhaps a little off topic  just be informed that these kind of messages can also be seen when you are debugging your code with a breakpoint inside an async function like setTimeout like below    Violation   setTimeout  handler took 43129ms   That number  43129ms  depends on how long you stop in your async function

User · Answer

It seems you have found your solution  but still it will be helpful to others  on this page on point based on Chrome 59   4 Note the red triangle in the top-right of the Animation Frame Fired event  Whenever you see a red triangle  it s a warning that there may be an issue related to this event   If you hover on these triangle you can see those are the violation handler errors and as per point 4  yes there is some issue related to that event

[javascript] Chrome violation : [Violation] Handler took 83ms of runtime

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