Well in that case extra RAM "should" help. Think of your computer as a library, with the Processor as the head Librarian.
Now think of the RAM as being the junior Librarians who go to look for the books that the Head Librarian asks for, or that you ask the Head Librarian for.
If you ask for a lot of books, or a lot of heavy books, books with a lot of detail, for example scanning the whole of the Library for a certain book...
Then the poor junior librarians have a hard time of it. Maybe its time to recruit some extra staff