So it says your clock speed is too low? You could overclock but that could damage your computer. I'm afraid you may need a PC upgrade to efficiently run it. 3D programs require quite a bit of CPU processing for certain simulations and modeling, while cycles rendering and other simulations need quite a bit of GPU processing (Nvidia CUDA if I remember correctly). Also depending on how complex your scenes will be you may need more ram too. I'm not saying you need a top of the line PC, but you may need to make some upgrades.