There was 4GB RAM on my MacBook Pro when I bought it, and over time it had gotten slow. The laptop is from late 2011, and only allows 8GB total, so I had my son get what was needed to add the extra 4GB RAM. The laptop is working so much faster now.
I’m not much in to computers either but how can a RAM memory chip become slow? I remember my brother telling me to sometimes remove and reinsert my drive and memory chips (I have a laptop) in order to clean the contacts.