A monitor that costs you something is a bad trade.

Both figures are measurements, not targets. Taken on an Apple silicon Mac running macOS 26, with the panel closed and Pinned sampling the rate once a second. The memory range is honest about a real difference: 33 MB on a launch where the panel has never been opened, and 67 MB after heavy use, because the panel’s charts and labels are built the first time you actually ask for them rather than at launch, and it loads each app’s icon to put beside its name. The upper figure is a ceiling rather than a trend. Opened and closed eight times in a row it reads 63, 64, 67, 67, 67, 67, 67, 67, so it climbs to a plateau and stops there. Opening the panel adds the per-app sampler at a 3 second floor. Closing the panel stops it unless an enabled app-rate alert needs one slower watcher every 10 seconds; without one, it stops completely. Your own numbers will move a little with your settings and your hardware.