Unfortunately, your post is rather lacking in any details! If we, fellow-users, are to have any chance of being able to offer possible solutions to you we really do need a lot more information from you.
So first, please tell us about your computer. This post will show you the level of detail that is needed for us to help you.
Also, please tell us about the actual content of your PS project. Are you using only still images or are there also videos? If so, what is the format of those videos? (If you're not sure about that, please read and follow this tutorial for how to provide this information.)
How many images/videos in total?
Are you adding any audio, e.g., music tracks? If so, what format are they in?