After a long period of torment, the problem that Google Chrome is slow to open the first web page has finally been solved.
Phenomenon:
1. The browser opens the first web page slowly (about 10 seconds), as do other websites; other browsers open smoothly
The solution is as follows:
paste the following line on the DOS command line and press Enter, get
RD /s /q "%USERPROFILE%\AppData\Roaming\Microsoft\Protect"