Slow Context New Submenu in Windows 10

Solution 1:

SOLVED IT FINALLY

Solution is to remove some of the universal apps that are causing issues with one update. Just open Power Shell and paste this into it:

Get-AppxPackage *zune* | Remove-AppxPackage
Get-AppxPackage *sketch* | Remove-AppxPackage
Get-AppxPackage *photos* | Remove-AppxPackage
Get-AppxPackage *wallet* | Remove-AppxPackage
Get-AppxPackage *solitai* | Remove-AppxPackage
Get-AppxPackage *bing* | Remove-AppxPackage
Get-AppxPackage *help* | Remove-AppxPackage
Get-AppxPackage *3d* | Remove-AppxPackage
Get-AppxPackage *reality* | Remove-AppxPackage
Get-AppxPackage *office* | Remove-AppxPackage

Once these apps are removed, wait a few seconds until you can see that the Windows taskbar flickers for a tiny moment. That is the sign that Windows's Explorer acknowledged these changes. Now you can try right clicking and select "New". Depending on the PC's processor speed, the delay is now either non-existent or at least greatly reduced. Side note: The first three apps in the lines above cause the longest delays.

See here for more info.

Solution 2:

I found a registry tweak to reduce the delay for submenu to pop up. Just open Registry Editor and browse to HKEY_CURRENT_USER\Control Panel\Desktop. By default, the MenuShowDelay value is set to 400 millisecond. You can change it to a lower number or even 0 to make the submenu pop up more quickly. Source: https://www.top-password.com/blog/how-to-speed-up-windows-10-menu-animations/