I always render to a new window myself because I hate the freeze time I get when I render in the window. I always render no less than 1000 x 1000 pxs and often larger. My image "Teacher" was rendered at just over 2000pxs. Then after I do any postwork on the image I just resize it. :-)

3-D Arena | Instagram | Facebook

I do not feel obliged to believe that the same God who has endowed us with sense, reason, and intellect has intended us to forgo their use.
-Galileo