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What does F12 mean? Slow down the webpage loading and click it to clearly see exactly where the freeze occurs
F12 is the browser's built-in developer tool. If web pages load slowly, images crack, or white screens spin, press it to open the Network panel, and you can clearly remember the status, size, time, and stuck segment of each request. No need to install any software; whatever you change is instantly restored as soon as you refresh, absolutely not damaged, and it's even more user-friendly than command-line tools....
