Irrlicht Engine

when window is not focused you should sleep (by calling "yield") . Even if you are not doing drawing also a small loop can eat up whole cpu power (assuming you have a multicore probably you have a fully used a single CPU). When window stop rendering you should also sleep that window else ...

Ok, first of all this has nothing to do with this thread I guess - unless this is some problem you didn't have with non-svn versions. Then games and 3d applications usually eat up more processing power - the reason is that games have to refresh the whole window each frame. But most Irrlicht example...

Let's see, there's a really weird problem on rendering, I've found that having opened Adobe Dreamweaver CS5 and running any application using Irrlicht screw up the app rendering doing it rendering when the window lost the focus (background) and eating more than 50% of cpu, until I move the (irrlicht...