The Terminal app is slow at reacting to input, lag is very noticeable when I press and hold Enter. When I type bash
to create a sub-shell it becomes much faster.
I believe this behavior started when I updated to Sierra, but I might be wrong.
Does anyone know why this happens?
iostat 5
for a while in one window will show you increasing CPU load - summary of load average - and most importantly if tps - io transactions per second is high. Those will always impact performance.