Originally Posted by
Harha
F1 prints the time it takes to render a frame full of samples in milliseconds along with some other information.
It's a raytracing based renderer and the default scene file that loads if you pass no arguments when running the program will perform slowly because the thing traces 10 indirect light bounces for each ray that gets fired through a pixel on the screen. It's not meant to be a realtime thing, it's purpose is mainly to render fancy images and maybe even video later on if I get to that point. And yeah it's purely CPU based.
The README.md in the repo has instructions on how to try load a different scene file, maybe do 'mirage --script cornellbox.lua', that one should be slightly faster so you can move the camera. Or you can edit the scene scripts yourself and lessen the amount of light bounces per ray and so on, to make it faster, if that is what you want.