Another thought:

Would a smaller ammount of mirroring surface speed up rendering? Let's imagine a
rectangular mirror 100x200 that bounces photons onto a screen (screen not
parallel to the mirror surface). The lit up area on the screen would look like
a certain polygonal shape and would be filled completely. Would it take less
time rendering if the rectangle was only reflecting photons from a 5mm rim
around the perimeter of the mirror creating somewhat of an outline polygonal
shape on the screen?

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