ControlMaster causes terminal lag on macOS 26.0.1 Tahoe

[Sergey Andrianov]

Hello,

I've recently upgraded OpenSSH to 10.1p1 on macOS Tahoe 26.0.1, and noticed
an issue with my client configuration:

Host *
   ControlMaster auto
   ControlPath ~/.ssh/.control-%r@%h:%p
   ControlPersist 15

When I connect to any host with PTY allocation, the terminal is severely
lagging - every character is being typed only after 5 presses. Setting
ControlMaster to no removes this problem, same as calling a command using
"ssh host my-command", git clone etc.

--
Sergey