I am experiencing extremely high CPU usage with the Mail application (macOS version 26.1). It interferes with all other open applications to a very high degree, such that most are paused while it goes through the intense-CPU cycle (on opening the application then periodically afterward).
Running this on a MBP Apple M1 Max.
The M1 Max is powerful enough that it shouldn't even notice Mail running. The fact that it is interfering with other apps means a process is hanging.
Recent macOS updates introduced privacy features that route remote content through Apple's relays. If this handshake fails, the process neagent or Mail itself will spike to 100% CPU trying to reconnect endlessly.
The M1 Max is powerful enough that it shouldn't even notice Mail running. The fact that it is interfering with other apps means a process is hanging.
Recent macOS updates introduced privacy features that route remote content through Apple's relays. If this handshake fails, the process neagent or Mail itself will spike to 100% CPU trying to reconnect endlessly.
Are you running any unneeded aftermarket utilities like ant-virus, so-called "cleaning" apps, or client-side VPNs? They can seriously affect performance
Mail app experiencing high CPU usage on MacBook Pro M1 Max
