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Responsive rendering in IE8

I have a problem with React webapp in IE8. Performance is great for modern versions of Chrome and FF. But, you do not know this, the client starts IE8, and the application loads the views very slowly in this browser, while the 4-second download time is normal. I am looking at an application that uses IE8 developer tools in IE8 (IE8 works in VirtualBox VM). In the generated call tree, two areas of the code take an average of 2 seconds . Having folded into these codes, I find React rendering methods such as mountComponent, mountChildren and createContentMarkup. There is a long, long tree of these calls with relatively little time (100-300 ms) occupied by consecutive MountComponent calls.

It seems that the constituents added to the view take a long time to add to the DOM, which is surprising for React.

Does anyone have experience in the same situation, I'm not sure how to proceed, except for dismantling the components and checking where the problem is.

Thanks for any advice.

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Source: https://habr.com/ru/post/1608052/

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