Hi,I want purchase new Laptop,which is best laptop by performance

Yes, Vithal is right... Buying a laptop or any other stuff depends upon your budget and requirement.... But for an answer for your post... I would advice you to go for a Dell Inspiron Laptop... Which model, that you have to decide upon your budget!!!

Thanks.

its better go to market and decide according to your budget and requirement. others can not be know what type of performance you want it completly depend on your use,other person can not be decides