Does `setViewOffset` performance scale with size of camera or subcamera?

Questions
, ,
1

Imagine you have a camera with a very high resolution camera and low resolution subcamera. Something like this:

const w = 300;
const h = 300;
const fullWidth = 5000;
const fullHeight = 5000;

camera.setViewOffset( fullWidth, fullHeight, 0, 0, w, h );

What kind of performance should one expect? Would the render take as long as a normal 5000px render, or a normal 300px render? Maybe somewhere in between?

Here’s the perspective camera .setViewOffset documentation.