HI,
Ok, so if I understand it correctly you are running a nested VM in your Windows 10 guest.
Is it not possible to run the android VM as a VMware Player VM? That would speed up the VM and avoid the extra nesting.
I completely understand wanting to keep your host OS without having a lot of cruft installed.
One other thing that might cause huge slow downs is if you are running AVG, Avast antivirus or BitDefender 2017 at the host.
If AVG or Avast then see:
XP VM suddenly slow, Win 7 fine
for a solution on using both antivirus products along with VMware
TL;DR
In Avast Settings, troubleshooting you should uncheck the "Enable hardware-assisted virtualization" feature.
In AVG Settings, troubleshooting, uncheck "Enable hardware-assisted virtualization" feature.
Note that you will have to reboot to apply the change.
If you are running BitDefender 2017 at the host then the only solution that I am aware about is to uninstall and revert to an older version of BitDefender.
--
Wil