Somehow, I agree with you. I can only say, if I uninstall classic shell the behaviour is gone.
About your suggestions:
> - Open Control Panel and then open Mouse. From the Mouse tab, adjust the double click speed.
There is no visible effect.
> - Try this:
http://winaero.com/blog/fix-touchpad-le ... ndows-8-1/ (Open Touchpad settings in Settings app and set it to "No delay (always on)".
There is no Touchpad section. The reason is, that Win10 is running in a VMware virtuell machine with Win7 host. This means, there is no native driver for it, VMware is emulating the mouse driver, including the touchpad. It is working fine in Win 7.
Do you know any other place (eg registry) for setting up the delay?