[Problem Solved] QT online installation and download is very slow

Problem Description

After installing Qt5.15.2, the download speed is only 20k, which is really too slow. It was not so slow when I installed Qt 6 last year. And there is no offline installation package for this version, it can only be installed online.

Solution

• If it is a version earlier than Qt 5.15, you can download the offline installation package：
  • University of Science and Technology of China: http://mirrors.ustc.edu.cn/qtproject/
  • Tsinghua University: https://mirrors.tuna.tsinghua.edu.cn/qt/
  • Beijing Institute of Technology: http://mirror.bit.edu.cn/qtproject/
  • China Internet Network Information Center: http://mirror.bit.edu.cn/qtproject/
• Slow download for Qt installer: Go to the mirror website to download : http://mirrors.ustc.edu.cn/qtproject/official_releases/online_installers/
• Slow download when installing online for Qt: Switch to the mirror source : Some articles on the Internet say that using flddler to change the HTTP proxy address is completely superfluous, and it is not so troublesome at all. The new version of the installer (after 4.0.1-1) itself provides the function of switching mirrors. Execute the installer on the command line, adding --mirror https://mirrors.ustc.edu.cn/qtproject parameters. For example, the command to execute the installer in the current directory under Windows is ./qt-unified-windows-x86-online.exe --mirror https://mirrors.ustc.edu.cn/qtproject.

You can first open cmd in the directory of the Qt installer, enter sudo ./<Qt安装器文件名>, and if you can open Qt installation, add it later --mirror https://mirrors.ustc.edu.cn/qtproject to install.