steps

1. In Mac OS Terminal, go to an empty directory and run sbt console
2. Paste in a long string and observe that there is a delay before each character appears on the screen

• macOS Ventura 13.2
• sbt version 1.8.2
• Java 17.0.6

problem

It seems to share the root cause with #6644, i.e., per-character invocation of isEchoEnabled which leads to forking stty. I opened a new issue only because it is not about sbt's own shell (sbt shell), which by the way works fine for me with regard to pasting in long strings.

expectation

Pasting is instantaneous. It should take only roughly as long as it would if you pasted the same string into a Scala shell you get by invoking scala.

notes