If you really want a preview without a final render, how about just
using a lower resolution?

If the resulting image gets too small for your taste, you can always
maximize the render window.


There is actually a strong point in favour of `Preview_End_Size`s
current mode of operation:

Except in quite specific circumstances, the effort of creating the
mosaic preview _adds_ to the effort of creating the final render; if you
carry on with the preview all the way down to full resolution, in the
worst case (scenes where there is little anti-alias work to do) this
might increase render time by as much as 25%.

With modern image sizes, chances are you won't need the 2x2 mosaic
preview step to decide whether you want POV-Ray to go for the final
render, so cutting the mosaic preview short after the 4x4 step you can
cut down the mosaic preview overhead to little more than 6%; and if the
8x8 step is detailed enough for you, the overhead drops to less than 2%.

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