'Chrome: page loading is slow until DevTools(F12) shows

My env: Chrome 96.0.4664.110 (Official Build) (64-bit) on windows 10

When I open a link in a new page, the page loading is very slow. I can see the loading icon is running but the page keeps blank for a long time(10 seconds or more).

But when I press F12 to show the DevTools window, the page content loads immediately.

So what is the problem, and how to fix it? Many thanks



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