I notice the installer created by InstallBuilder installs really slowly for large software especially on Windows platform. (The data below are collected on Windows platform)
I have a main installer about 1.74GB in size, which also calls some sub-installers and unzips some big zip files. The total installation size (after installed) is 17.9GB, with 165529 files, 18763 folders. The total installation time is over 80 minutes. We had our existing installer, installs the same set of files in 28 minutes.
The installation is much slower than a 7z unzip. The installer created for 3.12GB, 54176 files, 11051 folders takes 19 minutes, while 7z only takes 6 min. I understand it can be slower than a zip tool, but shouldn't be that slow.
Also the "unzip" action provided in the InstallBuilder is much slower than an "unzip" tool. I have about 20 zip files in total 8.59GB, 13655 files, 47 folders. The installBuilder unzips them in 19 minutes, while a standalone unzip tool unzips them only in 6 minutes.
BTW, the installer is created unsing "zip" compression method. I'm not enabling the debugger. Also I'm using InstallBuilder for Qt 8.5.
Any suggestion I can use to improve the installation time?
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