Firefox is using about half your Mac's CPU.
CPU shows the total, split into user and system on one chart. Beside it is every core on one scale, by cluster. Under them is a table of every app, with its helpers rolled up and a disclosure for its processes.
Firefox is using the most CPU, 51.4% across all cores.
| 51.4% | 6.4GB | 27W | 7 | |
| 4.6% | 4.8GB | 2.4W | 5 | |
| 2.6% | 5.1GB | 1.4W | 14 | |
| 1.9% | 2.4GB | 1.2W | 4 | |
| 1.1% | 4.1GB | 0.5W | 4 | |
| 0.8% | 1.2GB | 0.5W | 4 | |
| 0.5% | 949MB | 0.2W | 3 | |
| 0.4% | 539MB | 0.2W | 2 | |
| 0.4% | 305MB | 0.2W | 1 | |
| 0.4% | 442MB | 0.2W | 2 | |
| 0.3% | 197MB | 0.1W | 3 | |
| 0.2% | 252MB | 0.1W | 1 |
Firefox has used most of your CPU for 8 minutes.
51% of your Mac's CPU, about 3 times its usual. The CPU is at 69°C.
The Inspector, Settings and the full tables need a wider window.
Simulated data, running in your browser.
Every core gets the same bar.
Bars share one width, so a cluster takes room by how many cores it has. Each cluster is headed by its average. You can see at a glance whether one core is pinned or all of them are busy.
The units are your call.
Per Mac means 100% is the whole Mac, so apps add up to the CPU reading. Per core means 100% is one core, as Activity Monitor counts it, so a busy app can pass 100%.
The table moves with the timeline.
Sort by any column and scrub any chart. The rows change to that moment, so a spike at 2:14 has a name.
Checked against top.
Averaged over a run on an M4 Pro, Macometer read 35.6% where top read 35.5%.
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