Grade if many programs running at once, it can happen that the PC has to outsource processes to disk and thus is much slower. More RAM is worthwhile, but if you, for example, not full 4GB gets (the PC is not increased), then you also do not need 8GB. However, it can not hurt - was directly re-jazzed on the whole my Macbook. New Battery, RAM, SSD.
Would buy the product again, if I need it!