I've tried this out since first hearing about it. No speed change noticable 
for me. P-R 3.1r1 for Windows under Win95.

Message <365E8C26.8FF16A4A@zess.uni-siegen.de>, Markus Becker  typed...
>
>Hello,
>
>I thought that more people would already know this "bug". But I haven't
>seen it mentioned here.
>
>Version: 3.1.watcom.win32.r1
>
>Problem: If you do a rendering with radiosity on, it goes two-pass.
>The first pass always seemed very slow to me until I realized that
>it speeds up with a factor of at least 20 (twenty!!!) if you click and
>hold the title bar of the rendering window. If you do this, radiosity
>renderings are only about 50% slower than normal ones.
>
>Somebody should know this and it should be quite easy to fix, I guess
>it is a message handling problem between the rendering window and the
>calculation thread.
>
>Markus

-- 
 omniVERSE: beyond the universe
  http://members.aol.com/inversez/POVring.html
=Bob

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