Optimisation of a scene for quick rendering is the real art - if you would like to have a lot of control over parameters that decide about rendering speed - you should choose Vue Pro. A very heavy scene (with hundreds of objects and many millions polygons) will render for long minutes or hours on any software. When I set a scene, since start I optimize it - thanks to this I can get very complex Vue scenes that would crash my (not very powerful) machine if rendered on other programs. Actualy I work on AMD 2000+ 1 GB - but one year ago I had only a Celeron 600Mhz and 320 MB - but still I was able to build & reder complex scenes