VRay is using only %17 of cpu!

[Mose]

I had my first project, designd something and told my client that i will present everything next weekend. For the first time I spend so much time on Sketchup for 3D of this project. Modeling was just fine, I worked on every detail and created a 250mb model.
But about rendering, it only uses %17 of my CPU and it will take about 50 hours for a 1280X720p only for just one scene.
I have Displacement maps on just 2 materials and they are quite simple and Bump on some of the materials. maybe 10 materials have also Reflection.
With other programms this kind of a scene would take maybe 10 hours with my pc and would probably use %90-95 of my cpu, but Sketchup Vray is using only %17 of it. Is there a way to solve it? it's an emergency
THANKS!

[vigge50]

Maybe a late answer but have you look at the RAM usage? Displacement eat a lot of memory and since I started testing displacement my ram usage use to go up to 95% and CPU to 20% and then I have 16 gb ram. That is a model of 40 MB, with a mush bigger model and some displacement it is sertanly ram usage that slows down the process.