When a Mac feels sluggish with several apps open, memory pressure is more useful than the RAM number alone. Activity Monitor shows how macOS is balancing the memory available to your apps and the system.
Read the Memory tab
- Open Activity Monitor from Applications → Utilities.
- Choose the Memory tab.
- Look at the Memory Pressure graph while using the apps that normally slow the Mac down.
- Sort the process list by Memory to see which apps are using the most.
A green graph generally means memory is being managed comfortably. Yellow or red pressure that lasts during your usual workload can indicate that the Mac is working harder to manage its available memory. macOS may compress memory and use swap on the startup disk; swap alone is not proof of a problem.
Test your real workload
Open the browser tabs, creative apps or development tools you actually use, then watch the graph for a few minutes. Quit an app you recognize and do not need, and see whether the pressure changes. Restarting can clear a temporary buildup, but it will not change the amount of physical memory in the Mac.
If the graph stays green and the Mac is still slow, memory may not be the cause. Check CPU activity, available storage, the app itself and any external devices before drawing a conclusion.
Use the result when choosing a Mac
Memory needs depend on your apps and how many you keep open, not only on the chip name. Compare your real use over time rather than relying on a single benchmark or a one-size-fits-all claim. On Macs with unified memory, memory is shared across the system, so demanding graphics and workloads can change the amount available to apps.
Apple reference
Reviewed September 28, 2026. This guide links to Apple Support for platform instructions.