I recently ran into the exact same issue. After trying all the advice from this thread and a lot of other threads, I finally found a solution here, respectively in the linked issue here.
Disabling AMD Radeon graphics driver in the Windows device manager and switching to integrated Intel HD graphics worked for me – for whatever reason.
In my case, I found sh.exe shell to be significantly faster than bash.exe. You can find sh.exe in git_install_dir/bin.
Hope this helps people having this issue while only having integrated Intel HD graphics!