Add fetchpriority="high" to <script /> for loading async js source

[xingxinglieo]

For example, if you load an asynchronous route, the JS load after the first screen is a low-priority load, and then your chunks are split into dozens of chunks, then you will be blocked by some requests.The most serious problem is that the chunks are cached locally by the browser, but it takes hundreds of milliseconds to load them
see Network requests stuck in pending state

to resolve: script.setAttribute("fetchpriority","hight")
see MDN

[alexander-akait]

Sorry, no, we don't want to change default behaviour, we have #17249 if you want to set it, you can set it globally for all chunks

[xingxinglieo]

The problem has been solved, the option is a good way to solve, thank you for the answer