How do I know how much RAM my MacBook Pro is using
I have a MBP mid-2012 running Mojave, with 16 GB RAM, an SSD, and a fairly new battery. I upgraded to Catalina but had too many problems with my hard and software so downgraded back down to Mojave. I can no longer run diagnostics and took my laptop to the Genius Bar where I was told I'm not able to run diagnostics because Apple no longer supports my computer. He mentioned I was running 4 GB of memory, but then asked me if I was using third party software because my battery reading was off. My laptop should be screaming fast but it's not--I see the wheel of indecision every time I open my laptop and wait for it to catch up. How can I tell how much RAM I'm using?
[Edited by Moderator]