Check whether you have support for Windows WHPX by going to Control Panel > Programs and Features (appwiz.cpl) > Turn Windows features on and off (left):
If so, you have to uninstall Intel HAXM that you must likely used before for hardware acceleration and go ahead with Windows WHPX.
You can see all the details on Android's Configure hardware acceleration for the Android Emulator page > Configure VM acceleration on Windows.
You can run the AVD from command line to see what it uses:
> ANDROID-SDK\emulator\emulator.exe -list-avds ... > ANDROID-SDK\emulator\emulator.exe -avd <avd_name> ... Windows Hypervisor Platform accelerator is operational ...
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Resources:
- Android - Configure VM acceleration on Windows
https://developer.android.com/studio/run/emulator-acceleration#vm-windows - Microsoft - Hyper-V Android emulator support (May 2018)
https://devblogs.microsoft.com/visualstudio/hyper-v-android-emulator-support/