Long loading or saving


I have a problem, when I try to load something \ save ,- ue4 stops working, just stops at some of the percentages.

I have an old computer, that my configuration:

gtx 660ti;


8gb ram.

Is it a problem that my computer old?Or it is the bug of the new version UE 4.20?

Please, help me to solve this problem.

P.S.Sorry, it is my first question, if I doing something wrong say me)