Why does explorer.exe open with a few minutes delay?

Question

Windows

The question was already asked once, but I did not receive an answer except for the standard "check the disks for bad sectors and rearrange the Windows." Win 10 x64. The file system works fine, the disks are alive, any operations, if they are done in the window of an already open file manager, go without delay. Problems in trying, for example, to open explorer.exe from Chrome (show in folder for a downloaded file or save as ... for a picture) or with the middle button on an already open window. On initial boot, the appearance of icons on the desktop and then their transformation into thumbnails also takes several minutes. If you start poking at the taskbar while loading, without waiting for the end of the process and the launch of other programs, it is highly likely that explorer.exe will crash and restart. Where to dig? Or maybe there is a tool to "treat" the explorer itself. exe if someone intruded into it? But nothing of the kind was set, but OldNewExplorer or any other attachments with an injection.

Answer 1

Probably, one of the installed programs that support the function of redefining icons or the context menu hangs. Something like Dropbox, Git, SVN, OneDrive. The system is waiting for an answer, drawing these very icons, but no one answers it, that's the brakes

Answer 2

Among other things, in Windows 10, task manager, tab "Startup", there is "Influence on startup".