|"usually on laptops its imposiible to replace cpu"|
Maybe ten years ago. The CPUs in most laptops today are just as easy to upgrade as desktop chips.
Your integrated graphics chip is holding you back, not the CPU. Unfortunately you can't upgrade the graphics chip.
Rebuilt HTPC | Pentium M 780 @ 2.82GHz/667/2MB | HD 5750 with TrueHD/DTS-MA bitstreaming | 4GB | 1.0TB | Blu-Ray | Win7 Pro | 1080p projector