What are the benefits of computer memory?

The speed is faster in the case of multiple tasks,
The memory is actually a temporary storage space,
Every piece of software must be unified during operation,
So if the memory is relatively small, run a few programs and then run a program, they will grab the memory,
That is to say, the memory has seriously affected the speed of the machine, but if the memory is large enough,
This problem is obviously not going to happen. So it's not because the larger the memory, the faster you get. The smaller the memory, the faster you run only one or two tasks at the same time!