[iPLEOMAX]

Inshort: Don't use Resolution that says something like this: 640x480, 800x600, 1024x768... (Could differ a bit)

Use a Normal/Standard or High definition resolution (something over 1024x768 or equal).

Commonly used ones: 1280x720, 1400x1050, 1600x1200 or 1920x1080, 2560x1600..
Only if your Graphics card, Monitor supports and doesn't lag your game..

And you should use 32-bit. not 16..