If you want to run SLOWer, use a solution like VirtualBox or Parallels, or VMWare Fusion. If you want to run at NATIVE speed, then install bootcamp, partition your drive with enough space to hold whatever windows apps you're going to be using,. There seems to be some sort of a bug with VirtualBox's Retina display support, too, because when switching to Seamless mode the Windows desktop takes up roughly 65% of the screen, leaving the rest for macOS apps. In our tests we didn't find VirtualBox to be lagging behind any of the paid virtual machine software packages.

The default screen resolution for Mac OS X VirtualBox Guest is 1024×768.
Below shows how to change the screen resolution of Mac OS VirtualBox guest running on Windows 10.

Steps
1. Open “Command Prompt”. (press Win + x and select “Command Prompt”)

2. Navigate to VirtualBox folder in which “VBoxManage.exe” resides.
e.g.)

3. Set resolution by typing the command below.

The third parameter (i.e. “High Sierra”) should be your VM name.

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4. Start the VM

References
[1] Fix VirtualBox macOS High Sierra Screen Resolution (1920×1080 – 4K – 5K)

This is a very quick how-to on how to install VirtualBox on OSX. This lesson was created in June, 2014 and I’m running OSX 10.8 (Mountain Lion). I’m going to show you how to download and install VirtualBox 4.3.12 for OS X hosts. You may want to check out lesson 2 and lesson 3 also. Thanks!

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Get the two software packages that you need

Visit http://www.virtualbox.org/wiki/Downloads
Click on the link for OS X hosts.
This will bring up a download window with a filename similar to “VirtualBox-4.3.12-93733-OSX.dmg”.
Save the file some place where you will be able to find it later.
The file is fairly small; only about 120MB on my computer.
Next, click on the “All supported platforms” link next to “VirtualBox 4.3.12 Oracle VM VirtualBox Extension Pack” and save that file to the same location.

Confirm that you have the two packages that you need

Once you are done, check in the Finder and confirm that you have the two packages that you need. On my Mac, the display looks something like this. Of course, yours may look somewhat different depending on the way you have set Finder to display files.

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Mount the VirtualBox disk image to start the installation process

Double-click on the disk image file “VirtualBox-4….dmg” to mount or open the image so that you can see what is inside of it.
Note that the user manual comes as a PDF. VirtualBox does not have context-sensitive help. Instead, it comes with this PDF. It’s easy to forget to make a copy of the PDF during the installation process, but you may need it later, so drag the UserManual.pdf to your Desktop. You may want to rename it something like “VB manual.pdf.” If you are not a manual person, you can get to it online as well.
Double-click on the VirtualBox.pkg file to launch the actual installer.

Install the VirtualBox program

Double-click on the VirtualBox.pkg file to launch the actual installation.
Click Continue as prompted and then click “Install.” You will probably be prompted for your OSX administrative account password to enable the installation to proceed.
Enter the password to continue.
Click on “Install Software.”
On my MacBook Air, this took about one minute and I received a message saying that “The installation was successful.”
Click Close.

Start the application and install the extension pack

Switch into your Applications folder in the Finder.
Locate VirtualBox and double-click on the application.
It should launch and, with luck, you won’t see any errors.
The very first thing you need to do is to install the extension pack. Without the extension, you won’t have access to a number of useful features.
Click on VirtualBox > Preferences (or use the keyboard shortcut Cmd-,) . Then click on “Extensions” in the top bar (#1 above).
Now, click on the blue square with the yellow dropdown symbol (#2 above)
This will bring up a file navigator – navigate to the location where you saved the extension pack and select it.
You’ll see a warning message. Read it and click Install.
You’ll have to read (or at least scroll through) a long Oracle license agreement, before you can click OK or similar.
You’ll be prompted for your local administrator password. Enter it and click to proceed.
The installation will complete.
You should be able to click “OK” to leave the VirtualBox preferences screen.

That’s it! Now you’re ready to install a virtual machine.