These are general tips that are not restricted to any one particular game for additional performance.
Any setting used from this point on is your responsibility! Make sure you know what you are doing as no one involved with this Wikipedia is responsible for what you do with your device. Custom resolutions are really the only thing you should have to worry about though.
The software known as HiAlgo Switch can be used with native DirectX9 games to reduce the resolution of the 3D graphics within a game to increase performance. By reducing only the resolution of the 3D elements, the software is able to keep text and HUD overlays crisp and sharp. The idea of reducing 3D elements may not sound great, but its for games that simply won't go below that 1280x720 resolution.
HiAlgo Switch does not appear to always work with the next trick.
Using an Older DirectX version
The easiest way to know whether or not the game is using an older version of DirectX once applying this tweak, is to use MSI Afterburner. It will display what version of DirectX is being used along with the framerate.
To use DirectX9 or DirectX10, you simply add the line -dx9 or -dx10 to the end of the target line found in the properties of a shorcut to your game. If you don't already have one on your desktop, you can simply create one.
So first go to the shortcut, right click it, go properties, find the box that has "target" next to it. Go to the end of the line and just after the quotation mark, type a space and put -dx9 or -dx10.
Adding Custom Resolutions
By adding custom resolutions in Intel Graphics control panel, you may be able to unlock new resolutions for use in some games. Remember, when adding custom resolutions to the GPD Win you must do it backwards due to the natural orientation of the screen being portrait. So 1920x1080 becomes 1080x1920.
A good starting place would be to add the custom resolution of 544 x 960 60HZ as this is a 16:9 screen resolution that I have personally tested and found to work
Should for any reason your screen not accept the resolution and no longer display what is happening, the best way to resolve it will be to wait for 15 seconds and see if it returns to the default settings. If it doesn't, don't panic, simply hook your console up to an hdmi source and see if you can backtrack through that hdmi source.