A notice for folks running hgpovray38 or povr.

On my Ubuntu 20.4.1 system just tripped on a significant performance 
issue with the preview feature when using the Simple DirectMedia Layer 
2.0 version. SDL2.0 the usual default, if the library is available when 
compiling.

You use the preview feature with radiosity always, but one can also set 
preview start and end (+sp32 +ep8) for non-radiosity renders.

No idea what's happening, but when timing with /usr/bin/time, what I see 
is a big jump in elapsed time. Using x11 or sdl1.2 on my current example 
render I get:

31.36user 0.14system 0:09.83elapsed

increasing to:

34.49user 4.54system 0:24.44elapsed

with sdl2.0. (+148%)

Bill P.

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