“Violation readystatechange handler took 760ms” after update to latest Chrome

After updating to the latest Google Chrome release we are getting errors when we open colorbox on our website:

Synchronous XMLHttpRequest on the main thread is deprecated because of its detrimental effects to the end user's experience. For more help, check https://xhr.spec.whatwg.org/.

[Violation] 'readystatechange' handler took 760ms
[Violation] Forced reflow while executing JavaScript took 51ms
[Violation] Forced reflow while executing JavaScript took 43ms
[Violation] Forced reflow while executing JavaScript took 38ms

This only happens sometimes and when we get those errors colorbox isn't working properly, is there maybe a bug on Google Chrome?

edit: Magento merging javascript is causing the error, it's not working right, if I don't merge them I don't get these errors and it's loading correctly

 VM23586:4 Uncaught TypeError: Cannot set property 'value' of null  at choose (eval at <anonymous> (0a9e2e3….js:11743), <anonymous>:4:73)  at HTMLImageElement.onclick (letto-moderno-imbottito-prisma.html:1)

Uncaught TypeError: Cannot read property 'close' of undefined  at HTMLDivElement.onclick (letto-moderno-imbottito-prisma.html:1)

Answers:

Answer

Chrome is just saying that your code is blocking the UI too much.

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