Hello I have a mid 2009 macbook 4gb ram 1tb hard drive and i was wondering is it a better idea to stay with snow leopard os or upgrade to a newer os. Would lion or mountain lion make my mac any faster? I have seen all the features on lion and mountain lion and i am only thrilled about a few. I have used snow leopard for a long time and i feel fine with it but i want to make an upgrade. Does anyone know the pros and cons of lion and mountain lion? i have heard many people like them and many people prefer snow leopard much more. Does anyone know how my laptop would act with lion or mountain lion? If it makes it slow down i wouldnt want to upgrade but if it would be fine i might just want to switch. I dont want to spend money on one of them and then find out that it sucks more then the one i have now.