Controls the absolute maximum number of rendered pixel before any upscaling such that doesn't go higher than the specified 16:9 resolution of this variable. For instance set this value to 1440 so that you are not rendering more than 2560x1440 = 3.6M pixels. This is useful to set this on PC in your project's DefaultEditor.ini so you are not rendering more pixel on PC in PIE that you would in average on console with your project specific dynamic resolution settings.
Usage
r.ScreenPercentage.MaxResolution [value]
Set via the console (~) or in DefaultEngine.ini / DefaultGame.ini.
