I'm with you there, Ben, but there's only so much processing power to go around. Lightworks runs a nominal rendering at 160 percent of processor capacity. Good thing, dual processors....
The only way to cope, pragmatically, is to make small renderings and render snapshots of problem areas to minimise the wait. I use a dual machine that allows me to work on other tasks in other applications, but it slows the rendering process down.... and so it goes.
Dwight Atkinson