The Lenovo G50-30 has an Intel Celeron processor family which is better than most many processor core laptops that have been available for more than a year. Most comparable spec notebook PCs that are a similar age to it have an Intel Core i7 processor family.
An Intel Celeron processor family is in fact the worst processor family across all many processor core laptops that were launched more than a year ago.
An Intel Core i7-4xxx processor family is the best processor family amongst comparable types of portable PC.
If you want a portable PC with a better processor family then you might also want to consider the Toshiba Satellite C55-B (£503.88) (Intel Pentium).