From Pov 3.5 (or even 3.1) there still is a delay after and of render.
It is caused by
- closing/flushing output file, -f elimitase it
- flushing all streams, -Ga eliminates it partialy
- rendeing of message window slooowly scrolling (in Win32 version), hidding 
messages window helps it.

but even with this there still is some delay.

Once I turned off everything (all outputs/streams etc) and then one render 
took 0.05 second (it was ofcourse siiiimple image in 50x50 resolution), so 
could accualy watch a little povray animtion in real time :)

It would be nice to make this behaviour default.

I.e make two render buttons - one designed for preview (no streams or 
messages, is there is no errors), and one for normal render (all streams, 
output file).

Later it would be very comfortable to have few render options (some of them 
could be predefined, some could be defined in project file  project.pov 
that will contain name of master *.pov to be rendered, and some INI options 
to choose between, and... but thats more future ideas :)

-- 
http://www.raf256.com/3d/
Rafal Maj 'Raf256', home page - http://www.raf256.com/me/
Computer Graphics

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